Biochemistry Questions and Answers – Biosynthesis and Degradation of Nucleotides

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Biosynthesis and Degradation of Nucleotides”.

1. An amino group donated by glutamine is attached at C-1 of PRPP, this results in ____________
a) 5-phosphoribosylamine
b) 4-phosphoribosylamine
c) 3-phosphoribosylamine
d) 2-phosphoribosylamine
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2. The first intermediate with a complete purine ring is ____________
a) Inosinate
b) Formate
c) Aspartate
d) Glycine
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3. Which of the following is an important precursor in the purine pathway?
a) Glycine
b) Aspartate
c) Glutamine
d) Leucine
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4. Which of the following is an important precursor in pyrimidine pathway?
a) Glycine
b) Aspartate
c) Glutamine
d) Leucine
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5. In the first committed step of pyrimidine biosynthesis, the reaction is catalyzed by ____________
a) Adenylate kinase
b) Aspartate transcarbamoylase
c) Dihyhroorotase
d) Cytidylate synthase
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6. Phosphorylation of AMP to ADP is promoted by ____________
a) Adenylate kinase
b) Aspartate transcarbamoylase
c) Dihyhroorotase
d) Cytidylate synthase
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7. CTP is formed from UTP by the action of ____________
a) Adenylate kinase
b) Aspartate transcarbamoylase
c) Dihyhroorotase
d) Cytidylate synthase
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8. Conversion of dUMP to dTMP is catalyzed by ____________
a) Thymidylate synthase
b) Dihydrofolate reductase
c) Dihyhroorotase
d) Cytidylate synthase
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9. Adenosine deaminase deaminates adenosine to ____________
a) Hypoxanthine
b) Inosine
c) Xanthine
d) Guanosine
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10. Which of the following is degraded to methylmalonyl semialdehyde?
a) Glutamine
b) Tyrosine
c) Thymine
d) Leucine
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Sanfoundry Global Education & Learning Series – Biochemistry.

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