IB Unit 2 Molecular Biology SL

Which of the following reactions occurs when a dipeptide is formed from amino acids?

• Hydrolysis

• Denaturation

• Condensation

• Oxidation

What is the function of helicase?

• It forms bonds between DNA nucleotides.

• It adds new nucleotides to the DNA helix.

• It forms the DNA helix.

• It separates DNA strands.

Of the following products, which is produced by both anaerobic respiration and aerobic respiration in humans?

I. Pyruvate

II. ATP

III. Lactate

• I only

• I and II only

• I, II and III

• II and III only

Which structure represents an amino acid?

• A

• B

• C

• D

Why is the action spectrum for photosynthesis similar to the absorption spectra of photosynthetic pigments?

• Photosynthetic pigments have the same optimum temperature as the enzymes used in photosynthesis.

• Plants absorb the same photosynthetic pigments for use in photosynthesis.

• Only wavelengths of light absorbed by pigments can be used in photosynthesis.

• The amount of energy absorbed by photosynthetic pigments is equal to the activation energy for photosynthesis.

What is a difference between the sense and antisense strands of DNA?

• Nucleotides are linked to the sense strand by hydrogen bonding during transcription, but not to the antisense strand.

• The sense strand has the same base sequence as tRNA, but the antisense strand does not.

• Nucleotides are linked to the antisense strand by hydrogen bonding during transcription, but not to the sense strand.

• The antisense strand has the same base sequence as mRNA but the sense strand does not.

Which molecule is a monosaccharide?

• Ribose

• Glycogen

• Amylase

• Glycerol

Which of the following features are correct for hydrogen bonding?

I. It is involved in the cohesion of water.

II. It results in the thermal properties of water.

III. It is a bond within the water molecule.

• I and II only

• II and III only

• I and III only

• I, II and III

What is one role of the element phosphorus?

• It forms part of the structure of amino acids.

• It forms part of the structure of fatty acids.

• It forms part of the structure of ribose.

• It forms part of the structure of nucleotides.

In the graph below which line shows an action spectrum of photosynthesis?

• A

• B

• C

• D