Question

1) In the CAC (citric acid cycle)... (Choose All)

A) CO2 is released as a waste product

B) electron carriers are reduced

C) ATP is synthesized via oxidative phosphorylation

D) acetyl CoA is completely oxidized

2) During the CAC (citric acid cycle), the two acetyl CoAs (what remains from one glucose molecule) yield...(Choose All)

A) 8 reduced electron carriers

B) 2 ATPs

C) 2 oxaloacetate molecules

D) 4 CO2

Answer 1

Q1. A, B, D are correct

A. CO2 is released as water product because it is not utilized anywhere for the formation of any other molecule.

B. Electron carriers FAD+ and NAD+ are reduced to FADH2 amd NADH respectively.

C. Incorrect statement, ATP is synthesized via substrate level phosphorylation.

D. Acetyl co A is completely oxidized to CO2, ATP and reduced electron carriers.

Q2. A, B, C, D

For one cycle of CAC,

3 NADH and 1 FADH2 are formed (4 electron carriers)

1 ATP

1 oxaloacetate

2 CO2

So, for 2 cycles of CAC,

8 electron carriers

2 ATP

2 oxaloacetate

4 CO2 are formed

For more clarity please see the diagram and reaction below.

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