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The Citric Acid Cycle Exam Questions and Answers 100% Solved | Graded A+ 7. Acetyl-CoA labeled with 14C in both of its acetate carbon atoms is incubated with unlabeled oxaloacetate and a crude tissue preparation capable of carrying out the reactions of the citric acid cycle. After one turn of ...

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  • October 9, 2024
  • 14
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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©JOSHCLAY 2024/2025 YEAR PUBLISHED, 2024.
The Citric Acid Cycle Exam Questions

and Answers 100% Solved | Graded A+


7. Acetyl-CoA labeled with 14C in both of its acetate carbon atoms is

incubated with unlabeled oxaloacetate and a crude tissue preparation

capable of carrying out the reactions of the citric acid cycle. After one turn

of the cycle, oxaloacetate would have 14C in:



A) all four carbon atoms.

B) no pattern that is predictable from the information provided.

C) none of its carbon atoms.

D) the keto carbon and one of the carboxyl carbons.

E) the two carboxyl carbons. - ✔✔E

2. Which of the below is not required for the oxidative decarboxylation of

pyruvate to form acetyl-CoA?



A) ATP

B) CoA-SH

C) FAD

, ©JOSHCLAY 2024/2025 YEAR PUBLISHED, 2024.
D) Lipoic acid

E) NAD+ - ✔✔A

3. Which combination of cofactors is involved in the conversion of pyruvate

to acetyl-CoA?



A) Biotin, FAD, and TPP

B) Biotin, NAD+, and FAD

C) NAD+, biotin, and TPP

D) Pyridoxal phosphate, FAD, and lipoic acid

E) TPP, lipoic acid, and NAD+ - ✔✔E

4. Which of the following statements about the oxidative decarboxylation of

pyruvate in aerobic conditions in animal cells is correct?



A) One of the products of the reactions of the pyruvate dehydrogenase

complex is a thioester of acetate.

B) The methyl (—CH3) group is eliminated as CO2.

C) The process occurs in the cytosolic compartment of the cell.

D) The pyruvate dehydrogenase complex uses all of the following as

cofactors: NAD+, lipoic acid, pyridoxal phosphate (PLP), and FAD.

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