1. For the pyruvate dehydrogenase complex, what is the specific chemical functio

ID: 69382 • Letter: 1

Question

1. For the pyruvate dehydrogenase complex, what is the specific chemical function of the lipoic acid cofactor?

A. activation of acetyl-CoA

B. oxidation of lipoic acid

C. reduction of NAD+

D. transfer of the acetyl group to CoA

E. decarboxylation of pyruvate

2. For the pyruvate dehydrogenase complex, what is the specific chemical function of the FAD cofactor?

A. activation of acetyl-CoA

B. oxidation of lipoic acid

C. reduction of NAD+

D. transfer of the acetyl group to CoA

E. decarboxylation of pyruvate

3. When carbon is a limiting factor, many organisms will skip which steps in the Tricarboxylic Acid Cycle?

A. the steps liberating CO2

B. the hydrolysis steps

C. the formation of GTP

D. the loss of CoA

E. all steps producing NADH

Explain

1. D. transfer of the acetyl group to CoA

2. C. reduction of NAD+ (it converts dihydrolipoic acid and NAD+ into lipoic acid and NADH)

3. the step liberating CO2

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