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Theory">Photosynthesis Theory</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20556/photosynthetic-pigments-.html" title="Photosynthetic pigments ">Photosynthetic pigments </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../15727/photosynthesis-experiments.html" title="Photosynthesis Experiments">Photosynthesis Experiments</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../16980/genetics-activities-for-learning.html" title="Genetics Activities for Learning">Genetics Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17813/chromosomes-genes-alleles.html" title="Chromosomes genes & alleles">Chromosomes genes & alleles</a></li><li class="" style="padding-left: 28px"><i class="expander fa 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class="expander fa fa-caret-right "></i><a class="" href="../17817/theoretical-genetics-1.html" title="Theoretical Genetics 1">Theoretical Genetics 1</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../23787/stargardt-disease.html" title="Stargardt disease">Stargardt disease</a></li></ul><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17818/theoretical-genetics-2.html" title="Theoretical Genetics 2">Theoretical Genetics 2</a></li><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17819/sex-linked-genes.html" title="Sex Linked Genes">Sex Linked Genes</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../17825/is-genetics-an-embarrassment-to-biology-education-.html" title="Is genetics an embarrassment to biology education? ">Is genetics an embarrassment to biology education? </a></li></ul><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17809/hairy-hands-genetics-of-mid-digital-hair.html" title="Hairy Hands - genetics of mid-digital hair">Hairy Hands - genetics of mid-digital hair</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17810/pedigree-chart-phenotype-ratios.html" title="Pedigree Chart & Phenotype Ratios">Pedigree Chart & Phenotype Ratios</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17820/ia-maize-genetics-experiment.html" title="IA Maize Genetics Experiment">IA Maize Genetics Experiment</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17823/genetically-modified-organisms.html" title="Genetically Modified Organisms.">Genetically Modified Organisms.</a></li><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17824/introduction-to-cloning.html" title="Introduction to Cloning.">Introduction to Cloning.</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../33736/cloning-ethics-quiz.html" title="Cloning ethics - quiz">Cloning ethics - quiz</a></li></ul><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17811/therapeutic-cloning-debate-.html" title="Therapeutic Cloning Debate ">Therapeutic Cloning Debate </a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../16981/ecology-activities-for-learning.html" title="Ecology Activities for Learning">Ecology Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17905/ecological-terms.html" title="Ecological terms.">Ecological terms.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17906/food-webs.html" title="Food Webs">Food Webs</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17927/mesocosm-lab.html" title="Mesocosm Lab">Mesocosm Lab</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../23435/ecology-mini-investigation.html" title="Ecology mini investigation">Ecology mini investigation</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../33629/ecology-field-trip-at-home.html" title="Ecology field trip - at home">Ecology field trip - at home</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17907/energy-flow.html" title="Energy Flow.">Energy Flow.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17912/carbon-cycle-skills.html" title="Carbon Cycle Skills">Carbon Cycle Skills</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17908/enhanced-greenhouse-effect.html" title="Enhanced Greenhouse Effect.">Enhanced Greenhouse Effect.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17909/climate-change.html" title="Climate Change.">Climate Change.</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../16985/evolution-activities-for-learning.html" title="Evolution: Activities for Learning">Evolution: Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../15988/evolution-introduction.html" title="Evolution introduction">Evolution introduction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../15990/variation-overproduction.html" title="Variation & overproduction">Variation & overproduction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../15989/evolution-examples.html" title="Evolution examples">Evolution examples</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19320/classification-binomial-names.html" title="Classification & binomial names">Classification & binomial names</a></li><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../15991/classification-of-plants.html" title="Classification of Plants">Classification of Plants</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../19306/plant-classification-quiz.html" title="Plant classification quiz">Plant classification quiz</a></li></ul><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../15993/classification-of-animals.html" title="Classification of Animals">Classification of Animals</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../23751/classification-games.html" title="Classification games">Classification games</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18912/intro-to-cladistics.html" title="Intro to cladistics">Intro to cladistics</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18910/reclassification-of-figworts-using-cladistics.html" title="Reclassification of figworts using cladistics">Reclassification of figworts using cladistics</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../18027/humans-activities-for-learning.html" title="Humans Activities for Learning">Humans Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18028/digestion-enzymes-intro-.html" title="Digestion & Enzymes Intro ">Digestion & Enzymes Intro </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18029/ia-lipase-experiment.html" title="IA Lipase Experiment">IA Lipase Experiment</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18033/structure-of-the-digestive-system.html" title="Structure of the digestive system.">Structure of the digestive system.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18030/intestine-structure-function.html" title="Intestine Structure & Function.">Intestine Structure & Function.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18031/blood-and-blood-vessels.html" title="Blood and Blood Vessels">Blood and Blood Vessels</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18032/heart-dissection-diagram.html" title="Heart Dissection & Diagram">Heart Dissection & Diagram</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18026/controlling-heartbeat.html" title="Controlling Heartbeat">Controlling Heartbeat</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18590/blood-clotting-and-heart-disease.html" title="Blood clotting and heart disease.">Blood clotting and heart disease.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18117/antigens-and-antibodies-.html" title="Antigens and antibodies ">Antigens and antibodies </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18180/hiv-and-aids.html" title="HIV and AIDS">HIV and AIDS</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18116/immune-system-.html" title="Immune System ">Immune System </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18115/alveoli-gas-exchange.html" title="Alveoli & gas exchange">Alveoli & gas exchange</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19330/ventilation-lung-disease.html" title="Ventilation & lung disease">Ventilation & lung disease</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18421/nerve-impulses.html" title="Nerve impulses.">Nerve impulses.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18461/synapses.html" title="Synapses">Synapses</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../31311/chemicals-which-affect-synapses.html" title="Chemicals which affect synapses">Chemicals which affect synapses</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19886/hormones-introduction.html" title="Hormones introduction">Hormones introduction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19894/homeostasis-of-glucose.html" title="Homeostasis of Glucose.">Homeostasis of Glucose.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19907/harvey-and-the-search-for-ova.html" title="Harvey and the search for ova">Harvey and the search for ova</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19908/hormones-and-the-menstrual-cycle.html" title="Hormones and the menstrual cycle">Hormones and the menstrual cycle</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19927/hormones-in-ivf.html" title="Hormones in IVF">Hormones in IVF</a></li></ul></ul><li class=" parent std-toplevel" style="padding-left: 4px"><i class="expander fa fa-caret-right "></i><a class="" href="../17178/additional-hl.html" title="Additional HL">Additional HL</a></li><ul class="level-1 "><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17917/hl-nucleic-acids-activities-for-learning.html" title="HL Nucleic Acids Activities for Learning">HL Nucleic Acids Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17918/dna-structure-extras-for-hl.html" title="DNA structure - Extras for HL">DNA structure - Extras for HL</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../16141/dna-replication-for-hl-students.html" title="DNA Replication for HL Students">DNA Replication for HL Students</a></li><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17920/transcription-extras-for-hl.html" title="Transcription - extras for HL">Transcription - extras for HL</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../37259/extension-concept-hydrolysis-of-atp.html" title="Extension concept - Hydrolysis of ATP">Extension concept - Hydrolysis of ATP</a></li></ul><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18048/translation-ribosomes.html" title="Translation & ribosomes">Translation & ribosomes</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17921/four-levels-of-protein-structure.html" title="Four levels of protein structure">Four levels of protein structure</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../18211/hl-metabolism-activities-for-learning.html" title="HL Metabolism Activities for Learning">HL Metabolism Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19840/activation-energy-and-enzyme-pathways.html" title="Activation energy and enzyme pathways">Activation energy and enzyme pathways</a></li><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19850/emergency-room-activity-enzyme-inhibition.html" title="Emergency room activity - enzyme inhibition">Emergency room activity - enzyme inhibition</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../19865/toxicology-training-course.html" title="Toxicology training course">Toxicology training course</a></li></ul><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17923/end-product-inhibition-of-enzymes.html" title="End product inhibition of Enzymes.">End product inhibition of Enzymes.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17922/hl-respiration-introduction.html" title="HL Respiration introduction">HL Respiration introduction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../16207/glycolysis-and-the-krebs-cycle.html" title="Glycolysis and the Krebs Cycle">Glycolysis and the Krebs Cycle</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18214/electron-transport-chain.html" title="Electron transport chain">Electron transport chain</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../16209/chloroplasts-and-photosynthesis.html" title="Chloroplasts and Photosynthesis">Chloroplasts and Photosynthesis</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../16210/light-dependent-reactions.html" title="Light Dependent Reactions">Light Dependent Reactions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../16211/light-independent-reactions.html" title="Light Independent Reactions">Light Independent Reactions</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17720/hl-plant-biology-activities-for-learning.html" title="HL Plant Biology - Activities for Learning">HL Plant Biology - Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17726/leaf-stomata-transpiration.html" title="Leaf stomata & transpiration">Leaf stomata & transpiration</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17721/vascular-tissues-introduction.html" title="Vascular tissues - introduction">Vascular tissues - introduction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17723/transport-in-xylem.html" title="Transport in xylem">Transport in xylem</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17727/experiments-on-transpiration.html" title="Experiments on Transpiration.">Experiments on Transpiration.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17724/transpiration-and-xerophytes-.html" title="Transpiration and Xerophytes ">Transpiration and Xerophytes </a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17763/phloem-and-translocation.html" title="Phloem and translocation">Phloem and translocation</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17722/meristems-and-growth.html" title="Meristems and Growth.">Meristems and Growth.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17804/hormonal-control-in-plants.html" title="Hormonal control in plants">Hormonal control in plants</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17725/reproduction-in-angiosperms.html" title="Reproduction in angiosperms.">Reproduction in angiosperms.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17808/seeds-flowering-phytochromes.html" title="Seeds, flowering & phytochromes">Seeds, flowering & phytochromes</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17888/hl-genetics-activities-for-learning.html" title="HL Genetics Activities for Learning">HL Genetics Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17889/meiosis.html" title="Meiosis.">Meiosis.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17890/di-hybrid-crosses.html" title="Di-Hybrid Crosses.">Di-Hybrid Crosses.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17892/polygenic-inheritance.html" title="Polygenic Inheritance.">Polygenic Inheritance.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17891/gene-linkage-1.html" title="Gene Linkage 1">Gene Linkage 1</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17894/gene-linkage-2.html" title="Gene Linkage 2">Gene Linkage 2</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../17901/gene-pools.html" title="Gene pools">Gene pools</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19670/polyploidy.html" title="Polyploidy">Polyploidy</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../19559/hl-animal-physiology-activities-for-learning.html" title="HL Animal Physiology Activities for Learning">HL Animal Physiology Activities for Learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19560/antibody-production.html" title="Antibody production">Antibody production</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19566/monoclonal-antibodies.html" title="Monoclonal antibodies">Monoclonal antibodies</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19565/vaccination.html" title="Vaccination">Vaccination</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19561/muscles-joints.html" title="Muscles & joints">Muscles & joints</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19564/muscle-structure-function.html" title="Muscle structure & function.">Muscle structure & function.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19681/osmoregulation.html" title="Osmoregulation">Osmoregulation</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19562/kidney-and-nephrons.html" title="Kidney and nephrons.">Kidney and nephrons.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18813/gamete-formation.html" title="Gamete formation">Gamete formation</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../16365/fertilization-blastocyst.html" title="Fertilization & blastocyst">Fertilization & blastocyst</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20080/pregnancy-and-birth.html" title="Pregnancy and birth">Pregnancy and birth</a></li></ul></ul><li class=" parent std-toplevel" style="padding-left: 4px"><i class="expander fa fa-caret-right "></i><a class="" href="../17193/options-.html" title="Options ">Options </a></li><ul class="level-1 "><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../21490/option-a-neurobiology-activities-for-learning.html" title="Option A - Neurobiology - Activities for learning">Option A - Neurobiology - Activities for learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../21399/nervous-system-formation.html" title="Nervous system formation">Nervous system formation</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../21401/synapses-and-nervous-system-plasticity.html" title="Synapses and nervous system plasticity">Synapses and nervous system plasticity</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../21519/brain-structure-and-function.html" title="Brain structure and function">Brain structure and function</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../21520/the-cerebral-cortex.html" title="The Cerebral cortex">The Cerebral cortex</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../21525/sensory-receptors-and-smell.html" title="Sensory receptors and smell">Sensory receptors and smell</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../21526/the-eye-and-photoreceptors.html" title="The eye and photoreceptors">The eye and photoreceptors</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../33371/reflexes.html" title="Reflexes">Reflexes</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../33372/conditioning-and-imprinting.html" title="Conditioning and imprinting">Conditioning and imprinting</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../25280/option-b-biotechnology-and-bioinformatics.html" title="Option B - Biotechnology and bioinformatics">Option B - Biotechnology and bioinformatics</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../32571/batch-fermentation-and-continuous-culture.html" title="Batch fermentation and continuous culture">Batch fermentation and continuous culture</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../25411/cryptic-messages-bioinformatics-introduction.html" title="Cryptic messages - bioinformatics introduction">Cryptic messages - bioinformatics introduction</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../25364/orf-activity.html" title="ORF activity">ORF activity</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../22063/option-c-ecology-activities-for-learning.html" title="Option C - Ecology Activities for learning">Option C - Ecology Activities for learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22081/describing-communities.html" title="Describing communities">Describing communities</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22083/limits-and-zones-lab.html" title="Limits and zones lab">Limits and zones lab</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22084/symbiosis-v-competitive-exclusion.html" title="Symbiosis v Competitive exclusion">Symbiosis v Competitive exclusion</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22085/modelling-energy-flow.html" title="Modelling energy flow">Modelling energy flow</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22086/predicting-ecosystems.html" title="Predicting ecosystems">Predicting ecosystems</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22089/modelling-nutrients.html" title="Modelling nutrients">Modelling nutrients</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22088/disturbance-vs-diversity.html" title="Disturbance vs Diversity">Disturbance vs Diversity</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22807/invasive-species.html" title="Invasive species">Invasive species</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22810/biomagnification.html" title="Biomagnification">Biomagnification</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22958/plastic-debris.html" title="Plastic debris">Plastic debris</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../23153/indicator-species-biotic-index.html" title="Indicator species & biotic index">Indicator species & biotic index</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../23154/conservation-methods.html" title="Conservation methods">Conservation methods</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22059/biodiversity-estimations.html" title="Biodiversity estimations">Biodiversity estimations</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../22060/lincoln-index-activities.html" title="Lincoln Index activities">Lincoln Index activities</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../27387/population-growth-curves.html" title="Population growth curves">Population growth curves</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../27433/fisheries-and-populations.html" title="Fisheries and populations">Fisheries and populations</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18998/nitrogen-cycle-applications.html" title="Nitrogen cycle - applications">Nitrogen cycle - applications</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../28235/phosphorus-cycle.html" title="Phosphorus cycle">Phosphorus cycle</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../20088/option-d-human-physiology-activities-for-learning.html" title="Option D - Human physiology Activities for learning">Option D - Human physiology Activities for learning</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20215/is-it-so-bad-to-eat-only-pizza.html" title="Is it so bad to eat only pizza?">Is it so bad to eat only pizza?</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20220/appetite-and-malnutrition.html" title="Appetite and malnutrition">Appetite and malnutrition</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20284/exocrine-glands.html" title="Exocrine glands">Exocrine glands</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20300/control-of-digestive-secretions.html" title="Control of digestive secretions">Control of digestive secretions</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20259/a-miracle-cure-for-ulcers.html" title="A miracle cure for ulcers">A miracle cure for ulcers</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20664/liver-structure-function.html" title="Liver structure & function.">Liver structure & function.</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20665/jaundice-liver-function.html" title="Jaundice & liver function">Jaundice & liver function</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20692/cardiac-muscle-myogenic-control.html" title="Cardiac muscle & myogenic control">Cardiac muscle & myogenic control</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20707/cardiology-role-play.html" title="Cardiology Role play">Cardiology Role play</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../24113/epidemiology-framingham-heart-study.html" title="Epidemiology - Framingham heart study">Epidemiology - Framingham heart study</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20706/pituitary-gland-and-hormones.html" title="Pituitary gland and hormones">Pituitary gland and hormones</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20732/oxygen-dissociation-curves.html" title="Oxygen dissociation curves">Oxygen dissociation curves</a></li><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20708/carbon-dioxide-and-bohr-shift.html" title="Carbon dioxide and Bohr shift">Carbon dioxide and Bohr shift</a></li></ul></ul><li class=" parent std-toplevel" style="padding-left: 4px"><i class="expander fa fa-caret-right "></i><a class="" href="../17622/the-investigation.html" title="The Investigation">The Investigation</a></li><ul class="level-1 "><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../21187/individual-investigation-skills-introduction.html" title="Individual investigation - skills introduction">Individual investigation - skills introduction</a></li><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17179/practical-scheme-of-work.html" title="Practical Scheme of Work">Practical Scheme of Work</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../16860/lab-protocols-for-the-biology-ib-guide.html" title="Lab protocols for the Biology IB guide">Lab protocols for the Biology IB guide</a></li></ul><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17623/planning-for-skills-progression.html" title="Planning for skills progression">Planning for skills progression</a></li><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17624/personal-engagement.html" title="Personal Engagement">Personal Engagement</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19063/personal-engagement-personality-quiz.html" title="Personal Engagement - personality quiz">Personal Engagement - personality quiz</a></li></ul><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../34461/three-ways-to-choose-a-topic-for-the-ia.html" title="Three ways to choose a topic for the IA">Three ways to choose a topic for the IA</a></li><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17625/exploration.html" title="Exploration">Exploration</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../23429/focusing-a-research-question.html" title="Focusing a research question">Focusing a research question</a></li></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17626/analysis.html" title="Analysis">Analysis</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../26255/ia-analysis-anova-or-t-test.html" title="IA Analysis - ANOVA or t-test?">IA Analysis - ANOVA or t-test?</a></li></ul><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17627/evaluation.html" title="Evaluation">Evaluation</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../17628/communication.html" title="Communication">Communication</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../38973/ia-ideas-during-a-pandemic-2020-21.html" title="IA ideas during a pandemic 2020-21">IA ideas during a pandemic 2020-21</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../30218/ia-avoiding-common-errors.html" title="IA - Avoiding common errors">IA - Avoiding common errors</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../34356/ia-experiments-that-could-be-done-at-home.html" title="IA Experiments that could be done at home">IA Experiments that could be done at home</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../34574/ia-experiment-ideas-inspired-by-youtube.html" title="IA experiment ideas inspired by Youtube">IA experiment ideas inspired by Youtube</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../15992/6-ecological-ideas-for-your-ia.html" title="6 Ecological ideas for your IA">6 Ecological ideas for your IA</a></li><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../20852/30-investigation-ideas-for-biology-ia.html" title="30 investigation ideas for Biology IA">30 investigation ideas for Biology IA</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../39689/investigating-strawberries-with-a-glucose-test-meter.html" title="Investigating strawberries with a glucose test meter">Investigating strawberries with a glucose test meter</a></li></ul><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../23240/16-new-experiment-ideas-for-biology-ia.html" title="16 new experiment ideas for Biology IA">16 new experiment ideas for Biology IA</a></li><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../26171/12-investigation-ideas-with-a-biological-twist.html" title="12 Investigation ideas with a biological twist.">12 Investigation ideas with a biological twist.</a></li><ul class="level-2 "><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../26186/body-temperature-data.html" title="Body temperature data">Body temperature data</a></li></ul><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../19329/ia-investigation-marking-sheet.html" title="IA Investigation - marking sheet">IA Investigation - marking sheet</a></li><li class="" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../21859/marking-rigour-ia-assessment-criteria.html" title="Marking rigour & IA assessment criteria.">Marking rigour & IA assessment criteria.</a></li></ul><li class="ancestor parent std-toplevel" style="padding-left: 4px"><i class="expander fa fa-caret-right fa-rotate-90"></i><a class="" href="../18404/quizzes-tests-revision.html" title="Quizzes tests & revision">Quizzes tests & revision</a></li><ul class="level-1 expanded"><li class="ancestor parent" style="padding-left: 14px"><i class="expander fa fa-caret-right fa-rotate-90"></i><a class="" href="../17665/the-exams.html" title="The Exams">The Exams</a></li><ul class="level-2 expanded"><li class="" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19051/describing-trends-in-ib-graphs.html" title="Describing trends in IB graphs">Describing trends in IB graphs</a></li><li class="current parent" style="padding-left: 28px"><i class="expander fa fa-caret-right fa-rotate-90"></i><a class="" href="paper-3-section-a-questions.html" title="Paper 3 Section A - questions">Paper 3 Section A - questions</a></li><ul class="level-3 expanded"><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../26073/graphical-analysis-skills-for-life.html" title="Graphical analysis - skills for life!">Graphical analysis - skills for life!</a></li></ul></ul><li class=" parent" style="padding-left: 14px"><i class="expander fa fa-caret-right "></i><a class="" href="../18403/a3-topic-revision-sheets.html" title="A3 topic revision sheets">A3 topic revision sheets</a></li><ul class="level-2 "><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18405/topic-1-cells-revision-activities.html" title="Topic 1 - Cells revision activities">Topic 1 - Cells revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../22372/topic-1-cells-sl-revision-list.html" title="Topic 1 - Cells SL revision list">Topic 1 - Cells SL revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19003/topic-2-molecular-biology-revision-activities.html" title="Topic 2 - Molecular biology revision activities">Topic 2 - Molecular biology revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../22373/topic-2-bio-molecules-sl-revision-list.html" title="Topic 2 - Bio molecules SL revision list">Topic 2 - Bio molecules SL revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../18999/topic-3-genetics-sl-revision-activities.html" title="Topic 3 - Genetics SL revision activities">Topic 3 - Genetics SL revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../22378/topic-3-genetics-sl-revision-list.html" title="Topic 3 - Genetics SL revision list">Topic 3 - Genetics SL revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19480/topic-4-ecology-sl-revision-activities.html" title="Topic 4 - Ecology SL revision activities">Topic 4 - Ecology SL revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../22395/topic-4-ecology-revision-list.html" title="Topic 4 - Ecology revision list">Topic 4 - Ecology revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19006/topic-5-evolution-sl-revision-activities.html" title="Topic 5 - Evolution SL revision activities">Topic 5 - Evolution SL revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../22474/topic-5-evolution-revision-list.html" title="Topic 5 - Evolution revision list">Topic 5 - Evolution revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20121/topic-6-human-physiology-sl-revision-activities.html" title="Topic 6 - human physiology SL revision activities">Topic 6 - human physiology SL revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../22396/topic-6-human-physiology-revision-list.html" title="Topic 6 - Human physiology revision list">Topic 6 - Human physiology revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20196/topic-7-nucleic-acids-hl-revision-activities.html" title="Topic 7 - Nucleic acids HL revision activities">Topic 7 - Nucleic acids HL revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../20139/topic-7-nucleic-acids-hl-revision-list.html" title="Topic 7 - Nucleic acids HL revision list">Topic 7 - Nucleic acids HL revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20787/topic-8-metabolism-hl-revision-activities.html" title="Topic 8 - Metabolism HL revision activities">Topic 8 - Metabolism HL revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../20198/topic-8-metabolism-hl-revision-list.html" title="Topic 8 - Metabolism HL revision list">Topic 8 - Metabolism HL revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20122/topic-9-plant-biology-hl-revision-activities.html" title="Topic 9 - Plant biology HL revision activities">Topic 9 - Plant biology HL revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../20773/topic-9-plants-hl-revision-list.html" title="Topic 9 - Plants HL - revision list">Topic 9 - Plants HL - revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../20849/topic-10-genetics-hl-revision-activities.html" title="Topic 10 - Genetics HL Revision activities">Topic 10 - Genetics HL Revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../20128/topic-10-genetics-hl-revision-list.html" title="Topic 10 - Genetics HL revision list">Topic 10 - Genetics HL revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="std-disabled" href="#" title="Topic 11 - Physiology HL Revision activities">Topic 11 - Physiology HL Revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../20115/topic-11-animal-physiology-revision-list.html" title="Topic 11 - Animal physiology revision list">Topic 11 - Animal physiology revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../23821/option-a-neurobiology-revision-activities.html" title="Option A - Neurobiology - Revision activities">Option A - Neurobiology - Revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../23822/option-a-neurobiology-sl-revision-list.html" title="Option A - Neurobiology SL Revision list">Option A - Neurobiology SL Revision list</a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../23831/option-a-neurobiology-hl-revision-list.html" title="Option A - Neurobiology HL Revision list">Option A - Neurobiology HL Revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa fa-caret-right "></i><a class="" href="../19001/option-c-ecology-revision-activities.html" title="Option C - Ecology revision activities">Option C - Ecology revision activities</a></li><ul class="level-3 "><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../27865/option-c-ecology-sl-revision-list-.html" title="Option C - Ecology SL revision list ">Option C - Ecology SL revision list </a></li><li class="" style="padding-left: 42px"><i class="expander fa fa-caret-right "></i><a class="" href="../27863/option-c-ecology-hl-revision-list.html" title="Option C - Ecology HL revision list">Option C - Ecology HL revision list</a></li></ul><li class=" parent" style="padding-left: 28px"><i class="expander fa 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<div id="main-column" class="span9"> <article id="paper-3-section-a-questions" style="margin-top: 16px;">
<h1 class="section-title">Paper 3 Section A - questions</h1>
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<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/06humans/ventilation_rates.jpg" style="width: 10px; height: 8px;"> Paper 3 section A is a new part of the IB Biology examinations this year in 2016</p><div class="blueBg"><p>The following details are adapted from Inthinking Chemistry pages by Geoff Neuss and information from the IBO</p><ul><li>Section A is worth 15 marks and covers skills related to the prescribed practicals or to experimental techniques in general.</li><li>Questions will probably be similar in HL and SL in any one year</li><li>It will have two parts,<ul><li>one data response question (worth approx. 9 marks)</li><li>several short-answer questions on experimental work, (worth approx. 6 marks)</li></ul></li><li>It is likely that questions on the Nature of Science will also be asked in Section A.</li></ul></div><p>The answer to Question 17 in the document <em>Frequently Asked Questions</em>, on the OCC, states that,</p><p style="text-align: center;"><strong>"some of the questions in section A of Paper 3 may be related to the prescribed practicals or to experimental techniques in general."</strong></p><p>As there are no prescribed experiments, only prescribed areas or techniques, the examiners cannot assume that all students are familiar with the same practical experiment. This means that the questions testing experimental work are likely to have a stem giving some specific information about the experiment.</p><p>The following questions show ideas of possible questions related to each of the prescribed practicals and may be a useful beginning in student preparations for paper 3.</p><div class="tib-quiz" data-quiz-id="189" data-structure="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" data-score-answers="6d4a526a457a48584f763758344a7649472f76324c53614b78524c393439595570496d5a5971374b38686f3d"><div class="exercise">
<h3>Practical 1: Calculating magnification and actual size</h3>
<p>Calculate the actual length of the neurone shown beloww.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/neurone_size.jpg" style="width: 466px; height: 310px;"></p>
<div class="q-answer">
<p> <input type="text" style="height: auto;"> <span class="review"></span> </p>
</div>
<div class="q-explanation">
<p>A safe method is to do the following:</p>
<ol>
<li>Estimate the number of scale bars which fit into the image, and estimate the length. <br>
In this case about 6 or 7 scale bars so 60 - 70 µm length.</li>
<li>Measure the length of the diagram in milimetres (not cm - because it's easier to divide a larger number and avoid decimals).</li>
<li>Measure the length of the scale bar in milimetres.</li>
<li>Divide the length of the diagram by the length of the scale bar and multiply by the size written on the scale bar.<br>
e.g. 140mm length / 20mm scale bar x 10µm = 70µm</li>
</ol>
</div>
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<div class="exercise">
<div class="q-question">
<h3>Practical 1: Calculating magnification and actual size</h3>
<p>Calculate the magnification of the diagram of a motor neurone show below.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/neurone_size.jpg" style="width: 466px; height: 310px;"></p>
</div>
<div class="q-answer">
<p> <input type="text" style="height: auto;"> <span class="review"></span> </p>
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<p>To calculate magnification you only need the scale bar.</p>
<ol>
<li>Measure the length of the scale bar in mm</li>
<li>Convert this to the same units as written on the scale bar</li>
<li>Divide the actual diagram size by the measurement written on the scale bar.</li>
</ol>
<p>For example</p>
<ol>
<li>length of scale bar is 20mm</li>
<li>this is 20 000 µm</li>
<li>so the magnification is 20 000 / 10 = X2000</li>
</ol>
</div>
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<h3>Practical 2 - Estimation of osmolarity in tissues</h3>
<p>In a simple experiment five cyllinders of potato were soaked in five solute concentrations as shown below.</p>
<p>Use the graph to estimate the solute concentration of the cytoplasm of the potato cell cytoplasm. </p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/osmosis_graph_expt.jpg" style="width: 600px; height: 204px;"></p>
</div>
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<p> How to do an estimate of the cytoplasm concentration.</p>
<ol>
<li>When the solution is the same as the cytoplasm concentration there will be no change in mass.</li>
<li>Draw a best ft line on the graph and estimate where it crosses the 0.0 mass change.</li>
<li>This is about 0.07 mol.</li>
</ol>
</div>
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<div class="q-question">
<h3>Practical 2 - Estimation of osmolarity in tissues</h3>
<p>In a simple experiment five cyllinders of potato were soaked in five solute concentrations as shown below.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/osmosis_graph_expt.jpg" style="width: 600px; height: 204px;"></p>
<p>List the factors which must be controlled to make the experiment a reliable fair test.</p>
</div>
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<div class="q-explanation">
<p>Other factors which could affect the rate of osmosis could be:</p>
<ul>
<li>temperature</li>
<li>the time allowed for diffusion</li>
<li>shape of the potatoe cyllinders</li>
<li>type of potato</li>
<li>skin on the potato</li>
<li>checking that all the salt has dissolved in the solution</li>
</ul>
</div>
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<div class="q-question">
<h3>Practical 2 - Estimation of osmolarity in tissues</h3>
<p>In a simple experiment five cyllinders of potatoe were soaked in five solute concentrations as shown below.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/osmosis_graph_expt.jpg" style="width: 600px; height: 204px;"></p>
<p>Explain what the figures +/-0.05g and +/-0.02mol indicate on the graph axes.</p>
</div>
<div class="q-answer">
<p> <input type="text" style="height: auto;"> <span class="review"></span> </p>
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<div class="q-explanation">
<p>These values show the uncertainty or the measurement.</p>
<p>+/- 0.05g means that a reading of 0.10g could be as little as 0.05g or as much as 0.15g.<br>
(The axis scale really should also have 2d.p. so that it matches the uncertainty)<br>
It is certain to be in between these values but we cannot know more precicely, because of the measuring equipment used.</p>
<p>The same logic can be applied to the concentration values. 0.10 mol could be 0.08 - 0.12 mol</p>
<p>Both of these 'uncertainties' are quite small, much smaller than the differences between concentrations shown on the graph, so we can infer that the data presented is quite reliable.</p>
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<h3>Practical 4 - Separating photosynthetic pigments by chromatography.</h3>
<p>A biologist extracted green pigments from a crushed leaf. The pigments extracted were placed on the base line of some chromatogtaphy paper and a solvent ran up the paper revealing the three pigments as shown in the diagram below.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/02_biochem/chromatography.png" style="width: 280px; height: 250px;"></p>
<p>Explain why the pigments each moved different distances.</p>
</div>
<div class="q-answer">
<p> <input type="text" style="height: auto;"> <span class="review"></span> </p>
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<p>There are two forces acting on the pigments during the chromatography:</p>
<ul>
<li>The pigments adhere to the paper</li>
<li>The pigments are carried by the solvent</li>
</ul>
<p>Because each pigment is made from a different molecule the forces are different.</p>
<p>Molecules which adhere to the paper very strongly don't move very far, those which only attach lightly to the paper move further.</p>
<p>Smaller molecules tend to get carried further by the solvent, as do those which dissolve more easily in the solvent.</p>
<p>The distance a pigment travels depends on the paper, the solvent and these forces.</p>
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<h3>Practical 4 - Separating photosynthetic pigments by chromatography.<img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/02_biochem/chromatography.png" style="width: 280px; height: 250px; float: right;"></h3>
<p>A biologist extracted green pigments from a crushed leaf. The pigments extracted were placed on the base line of some chromatogtaphy paper and a solvent ran up the paper revealing the three pigments as shown in the diagram.</p>
<p>An Rf value (retardation factor) can be calculated for a pigment which helps its identification. </p>
<ul>
</ul>
<p style="text-align: center;"><span class="math-tex">\(Rf = {distance .traveled .by .pigment \over distance.traveled. by. solvent. front}\)</span></p>
<p>Known Rf values for this equipment are:</p>
<ul>
<li>carotene - 0.91</li>
<li>chlorophyll a - 0.57</li>
<li>chlorophyll b - 0.40</li>
<li>pheophytin - 0.79</li>
</ul>
<p>Calculate the rf value of pigment A and suggest a name for this pigment.</p>
</div>
<div class="q-answer">
<p> <input type="text" style="height: auto;"> <span class="review"></span> </p>
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<div class="q-explanation">
<p>Distance of solvent front from the base line = 33 mm</p>
<p>Distance of the centre of pigment A from the base line = 29 mm</p>
<p>Rf value = 29 / 33 = 0.88</p>
<p>The closest pigment to the Rf value of 0.88 is Carotene with an Rf value of 0.91.</p>
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<h3>Practical 3 - Investigation of a factor affecting enzyme activity</h3>
<p>This apparatus was used to investigate how pH can change the rate of an enzyme controlled reaction.</p>
<p>The source of catalase was a piece of liver. pH buffer solutions were added to the test tube.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/catalase_expt.jpg" style="width: 320px; height: 249px;"></p>
<p>Explain how you would set up an investigation of pH using buffer solutions.</p>
<ol>
<li>How many different buffer solutions would you use, and which pH values?</li>
<li>How many repeats of each measurement would you need?</li>
<li>Why would a student need to consider the surface area, and the shape of the liver as well as its mass?</li>
</ol>
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<p>In order to see any pattern in the results there needs to be a range of buffer solutions covering pH5 to pH9 at least. A wider range would be better. This experiment would have 5 different pH values tested, pH5,6,7,8, and 9.</p>
<p>Each pH would need several repeats to check the reliability of the results. Three repeats would usually be sufficient.</p>
<p>The enzymes from the liver will contact the hydrogen peroxide on it's surface only. So although mass is important so will be shape as this will change the surface area if it is different.</p>
<p> </p>
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<h3>Practical 3 - Investigation of a factor affecting enzyme activity.</h3>
<p>This apparatus is used to test the rate of respiration with some insect larvae.</p>
<p>Respiration is a metabolic pathway controlled by enzymes, so the data gives us some information about the factors which affect enzymes.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/respirometer_maggots_expt.jpg" style="width: 400px; height: 329px;"></p>
<p>In an experiment to test the affect of temperature on enzyme controlled reactions a student wants to do experiments at five different temperatures, 0°C, 20°C, 40°C, 60°C and 80°C.</p>
<p>The teacher stopped the experiment because it was breaking the IB guidelines on animal experiments.</p>
<p>What is wrong with the plan? Explain why and suggest a better way to carry out the experiment.</p>
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<p>The IB guidelines state that animals should not be subjected to conditions outside the range of conditions they experience in nature. It is very likely that 80°C, and 60°C will cause harm, or kill the maggots.</p>
<p>It would be better to test the maggots at 5 temperatures between 10°C and 40°C.</p>
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<h3>Practical 5 - Attempting to create a sealed microcosm</h3>
<p>The diagram shows a simple meoscosm made by some students</p>
<p>.<img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/05ecology/mesocosm_finished.jpg" style="width: 200px; height: 261px;"></p>
<p>Outline some of the practical difficulties you might encounter in the construction of such a mesocosm, and suggest some precautions which might be taken to avoid harm to students or the animals in the mesocosm.</p>
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<p>There are lots of practical difficulties:</p>
<ul>
<li>Cutting the bottles is a bit dangerous and you must hold the bottle in such a way that you cannot stab you hand with the scissors as you make the first cut into the bottle.</li>
<li>The edges of the bottle must be the same size, and neatly cut to ensure a good seal.</li>
<li>If you use a glue gun there is a need to be careful not to burn yourself.</li>
<li>Putting the soil in without dropping too much into the water is tricky unless you have a long spoon / spatula.</li>
<li>Care must be taken to ensure that there is enough photosynthesis to provide oxygen for the spider. <br>
Pond weed is a good idea as it is likely to survive well, given enough light.</li>
</ul>
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<h3>Practical 5 - Attempting to create a sealed microcosm</h3>
<p>The photo shows a simple meoscosm made by some students</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/05ecology/2014-07-01-16.10.02-0000.jpg" style="width: 250px; height: 333px;"></p>
<p>Suggest how this mesocosm could be used to investigate how the number of hours of light in a 24 hour period affects the balance of plants and animals in the mesocosm.</p>
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<p>This is really a question about experiment design. </p>
<p>There would need to be five identical mesocosms each containing the same organisms.</p>
<p>Each mesocosm would be given a different lighting regime<br>
(e.g. 4 ours / day, 8 hours /day, 12 hours /day, 16 hours and 20 hours.)</p>
<p>A measure of the number of animals, and plants after a period of several weeks would be recorded.</p>
<p>Measurements could be taken each week for a couple of months, or even longer.</p>
<p>For more reliable results more mesocosms would be needed so there could be repeats.</p>
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<h3>Practical 7 - Measurement of transpiration rates using potometers</h3>
<p>This graph shows the changes in the rate of transpiration for an experiment with different humidities.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/hl_topics/transpiration_simple_graphtoo.jpg" style="width: 700px; height: 267px;"></p>
<p>What measurements would have to be taken using the apparatus above in order to calculate the "rate of transpiration" shown in the graph?</p>
<p>How would you calculate the rate of transpiration.</p>
<p>What problems would occur if a bubble of water was left underneath the disk of filter paper?</p>
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<p>The movement of the water in the capillary tube would been measured using the apparatus.</p>
<p>The time taken for the movement.</p>
<p>The rate would be calculated by dividing the movement by the time taken.</p>
<p>Better still the volume of water evaporated divided by the time taken.</p>
<p>If there was a bubble of water under the filter paper then the bubble would expand in size and the water in the capillary tube would not move.</p>
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<h3>Practical 6 - Monitoring of ventilation at rest, after mild & vigorous exercise</h3>
<p>This graph shows the results of an experiment to measure ventilation rates at different joggin speeds.</p>
<p>The red dots show the average rate and the blue bars show the range of readings taken.</p>
<p><img alt="" src="../../../ib/biology/images/flickr_cc_commercial_ok/06humans/ventilation_rates.jpg" style="width: 400px; height: 301px;"></p>
<ol>
<li>Describe how the ventilation rate changes as the jogging speed increases.</li>
<li>Suggest what you would expect to happen to the volume of each breath as the jogging speed increased.</li>
</ol>
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<p>As the jogging speed increases the ventilation rate increases at a constant rate.</p>
<p>There is a possitive correlation between joggins speed and ventilation rate.</p>
<p>The depth of each breath would also increase (especially at slower jogging speeds)</p>
<p>There is a limit to the volume of a breath, the tidal volume of the lungs.</p>
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