250+ TOP MCQs on Pathways of Amino Acid Degradation and Answers

Biochemistry Multiple Choice Questions on “Pathways of Amino Acid Degradation”.

1. Which of the following amino acids are exclusively ketogenic?
A. Leucine
B. Asparagine
C. Threonine
D. Proline

Answer: A
Clarification: Only two amino acids, leucine and lysine are exclusively ketogenic.

2. Which of the following are exclusively glucogenic?
A. Arginine
B. Leucine
C. Lysine
D. Threonine

Answer: A
Clarification: Leucine and lysine are exclusively ketogenic. Threonine is both ketogenic and glucogenic.

3. Which of the following yields acetyl co-A via aceto-acetyl co-A?
A. Leucine
B. Isoleucine
C. Threonine
D. Alanine

Answer: A
Clarification: Leucine, lysine, phenylalanine and tryptophan yield acetyl co-A via aceto-acetyl co-A.

4. Which of the following yields acetyl coA directly?
A. Phenylalanine
B. Isoleucine
C. Lysine
D. Alanine

Answer: B
Clarification: Isoleucine, leucine, threonine and tryptophan yield acetyl coA directly.

5. Which of the following produces pyruvate?
A. Leucine
B. Isoleucine
C. Lysine
D. Alanine

Answer: D
Clarification: The amino acids producing pyruvate are alanine, cysteine, glycine, serine, threonine and tryptophan.

6. Which of the following produces α-ketoglutarate?
A. Leucine
B. Threonine
C. Methionine
D. Proline

Answer: D
Clarification: Arginine, glutamate, glutamine, histidine and proline produce α-ketoglutarate.

7. Which of the following produce succinyl co-A?
A. Leucine
B. Isoleucine
C. Arginine
D. Alanine

Answer: B
Clarification: Isoleucine, methionine, threonine and valine produce succinyl co-A.

8. Fumarate is produced from four carbon atoms of _________
A. Tyrosine
B. Isoleucine
C. Threonine
D. Alanine

Answer: A
Clarification: Four carbon atoms of phenylalanine and tyrosine give rise to fumarate.

9. Which of the following produces oxaloacetate?
A. Aspartate
B. Isoleucine
C. Threonine
D. Alanine

Answer: A
Clarification: Asparagine and aspartate produce oxaloacetate.

10. The branched chain amino acid is not _________
A. Leucine
B. Isoleucine
C. Valine
D. Alanine

Answer: D
Clarification: Isoleucine, leucine and valine are the branched chain amino acids.