exam 4

Question 1

Explain what is meant by the term oxidative phosphorylation.

Answer 1

electrons are passed along the electron transport chain and are used to add phosphate to ADP to make ATP

Question 2

Name the enzyme involved in chemiosmosis

Answer 2

ATPase

Question 3

Explain how a high concentration of hydrogen ions (H+) is maintained in the intermembrane space.

Answer 3

1. (H+ ions) from reduced NAD
2. H+ ions pumped into intermembrane space
3. Energy is needed for pump

Question 4

Describe the role of the hydrogen ion concentration gradient in making available an accessible supply of energy for biological processes.

Answer 4

1. The H+ ions follow the diffusion gradient and this makes energy available to form ATP
2. ATP is an energy source for biological processes

Question 5

suggest what would happen in the Krebs

cycle if acetyl CoA became unavailable.

Answer 5

cycle would stop and the 4 carbon compound will accumulate

Question 6

Describe the role of RUBISCO in the production of GALP in the light-independent
reaction.

Answer 6

1. Rubisco is an enzyme that acts as a catalyst and is involved in carbon fixation to form GP in the calvin cycle
2. GP is then converted to GALP

Question 7

Describe how the membranes inside the chloroplast are involved in
photosynthesis.

Answer 7

1. Chloroplast is the site of the light-independent reactions
2. on the membrane there is chlorophyll which is the site of photosynthesis there is also ATPase on the thylakoid membranes
3. The Thylakoid membranes provide space for H+ ions to gather