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
Explanation: α-ketoglutarate is the precursor for arginine.
2. Pyruvate is the precursor for ____________
a) Alanine
b) Glutamate
c) Serine
d) Proline
View Answer
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
Explanation: Proline is the cyclized derivative of glutamate.
4. Precursor of glycine is ____________
a) Proline
b) Glutamine
c) Serine
d) Glutamate
View Answer
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
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
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
Explanation: Pyruvate gives rise to valine and isoleucine. Glutamate gives rise to glutamine, arginine, and proline. Serine gives rise to glycine and cysteine.
8. Which of the following is not an aromatic amino acid?
a) Phenylalanine
b) Tyrosine
c) Tryptophan
d) Leucine
View Answer
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
Explanation: Tyrosine can be formed by hydroxylation of phenylalanine.
10. Phosphoribosyl pyrophosphate is a precursor of tryptophan and ____________
a) Tyrosine
b) Histidine
c) Phenylalanine
d) Isoleucine
View Answer
Explanation: Phosphoribosyl pyrophosphate is a precursor of tryptophan and histidine.
Sanfoundry Global Education & Learning Series – Biochemistry.
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