Which molecule diagram corresponds to the name?

B

Which curve shows the concentration of product during the course of an enzyme-catalysed reaction?

A

Some centres commented that answer B could be considered a correct answer. The question is asking about the course of the reaction which makes A the best answer. Over 70 % of candidates answered correctly.

The apparatus shown was used to investigate the effect of varying carbon dioxide concentration on the rate of photosynthesis. Carbon dioxide concentrations were varied by adding different amounts of sodium hydrogen carbonate (NaHCO₃) to water.

What is the dependent variable in this investigation?

A. Temperature

B. Light intensity

C. Amount of NaHCO₃ added

D. Volume of oxygen produced

D

Which property of water accounts for its moderating effects on the Earth’s atmosphere?

A. Cohesive

B. Thermal

C. Transparency

D. Adhesive

B

The diagram shows a molecular structure.

Which type of molecule is shown?

A. Amino acid
B. Lipid
C. Carbohydrate
D. Nucleotide

B

In which processes are macromolecules broken down into monomers?

A. Anabolism and catabolism

B. Catabolism and hydrolysis

C. Hydrolysis and reduction

D. Reduction and anabolism

B

The diagram shows the structure of palmitic acid.

What type of fatty acid is palmitic acid?

A. It is monounsaturated.

B. It is polyunsaturated.

C. It is saturated.

D. It is a trans-fatty acid.

C

Which are necessary to make DNA replication semi-conservative?

I. Separation of the strands by RNA polymerase

II. Complementary base pairing

III. Use of a pre-existing strand as a template

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

C