Biochemistry Questions and Answers – Biosynthesis of Amino Acids

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Biosynthesis of Amino Acids”.

1. 3-phosphoglycerate is not the metabolic precursor for ____________
a) Serine
b) Glycine
c) Cysteine
d) Arginine
View Answer

Answer: d
Explanation: α-ketoglutarate is the precursor for arginine.

2. Pyruvate is the precursor for ____________
a) Alanine
b) Glutamate
c) Serine
d) Proline
View Answer

Answer: a
Explanation: α-ketoglutarate is the precursor for glutamate and proline. 3-phosphoglycerate is the precursor for serine.

3. The cyclized derivative of glutamate is ____________
a) Proline
b) Arginine
c) Glutamine
d) Serine
View Answer

Answer: a
Explanation: Proline is the cyclized derivative of glutamate.
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4. Precursor of glycine is ____________
a) Proline
b) Glutamine
c) Serine
d) Glutamate
View Answer

Answer: c
Explanation: Precursor of glycine and cysteine is serine.

5. Which of the following is a non-essential amino acid?
a) Methionine
b) Threonine
c) Lysine
d) Cysteine
View Answer

Answer: d
Explanation: Methionine, threonine, lysine, isoleucine, valine, and leucine are essential amino acids.

6. Which of the following gives rise to methionine, threonine, and lysine?
a) Pyruvate
b) Glutamate
c) Aspartate
d) Serine
View Answer

Answer: c
Explanation: Aspartate gives rise to methionine, threonine, and lysine. Branch points occur at aspartate semialdehyde, an intermediate in all three pathways, and at homoserine, a precursor of threonine and methionine.

7. Which of the following gives rise to valine and isoleucine?
a) Pyruvate
b) Glutamate
c) Aspartate
d) Serine
View Answer

Answer: a
Explanation: Pyruvate gives rise to valine and isoleucine. Glutamate gives rise to glutamine, arginine, and proline. Serine gives rise to glycine and cysteine.
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8. Which of the following is not an aromatic amino acid?
a) Phenylalanine
b) Tyrosine
c) Tryptophan
d) Leucine
View Answer

Answer: d
Explanation: Leucine is a non-aromatic amino acid.

9. Which of the following can be formed by hydroxylation of phenylalanine?
a) Serine
b) Tyrosine
c) Tryptophan
d) Leucine
View Answer

Answer: b
Explanation: Tyrosine can be formed by hydroxylation of phenylalanine.
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10. Phosphoribosyl pyrophosphate is a precursor of tryptophan and ____________
a) Tyrosine
b) Histidine
c) Phenylalanine
d) Isoleucine
View Answer

Answer: b
Explanation: Phosphoribosyl pyrophosphate is a precursor of tryptophan and histidine.

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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