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
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
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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
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Explanation: 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
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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
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Explanation: 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
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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
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Explanation: 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
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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
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Explanation: Asparagine and aspartate produce oxaloacetate.
10. The branched chain amino acid is not _________
a) Leucine
b) Isoleucine
c) Valine
d) Alanine
View Answer
Explanation: Isoleucine, leucine and valine are the branched chain amino acids.
Sanfoundry Global Education & Learning Series – Biochemistry.
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