Biochemistry Questions and Answers – Pathways of Amino Acid Degradation

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Pathways of Amino Acid Degradation”.

1. Which of the following amino acids are exclusively ketogenic?
a) Leucine
b) Asparagine
c) Threonine
d) Proline
View Answer

Answer: a
Explanation: 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
View Answer

Answer: a
Explanation: 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
View Answer

Answer: a
Explanation: Leucine, lysine, phenylalanine and tryptophan yield acetyl co-A via aceto-acetyl co-A.
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4. Which of the following yields acetyl coA directly?
a) Phenylalanine
b) Isoleucine
c) Lysine
d) Alanine
View Answer

Answer: b
Explanation: Isoleucine, leucine, threonine and tryptophan yield acetyl coA directly.

5. Which of the following produces pyruvate?
a) Leucine
b) Isoleucine
c) Lysine
d) Alanine
View Answer

Answer: d
Explanation: The amino acids producing pyruvate are alanine, cysteine, glycine, serine, threonine and tryptophan.
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6. Which of the following produces α-ketoglutarate?
a) Leucine
b) Threonine
c) Methionine
d) Proline
View Answer

Answer: d
Explanation: 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
View Answer

Answer: b
Explanation: Isoleucine, methionine, threonine and valine produce succinyl co-A.
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8. Fumarate is produced from four carbon atoms of _________
a) Tyrosine
b) Isoleucine
c) Threonine
d) Alanine
View Answer

Answer: a
Explanation: 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
View Answer

Answer: a
Explanation: Asparagine and aspartate produce oxaloacetate.
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10. The branched chain amino acid is not _________
a) Leucine
b) Isoleucine
c) Valine
d) Alanine
View Answer

Answer: d
Explanation: Isoleucine, leucine and valine are the branched chain amino acids.

Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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