MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is degraded to methylmalonyl semialdehyde? |
| A. | Glutamine |
| B. | Tyrosine |
| C. | Thymine |
| D. | Leucine |
| Answer» D. Leucine | |
| 2. |
Adenosine deaminase deaminates adenosine to ____________ |
| A. | Hypoxanthine |
| B. | Inosine |
| C. | Xanthine |
| D. | Guanosine |
| Answer» C. Xanthine | |
| 3. |
Conversion of dUMP to dTMP is catalyzed by ____________ |
| A. | Thymidylate synthase |
| B. | Dihydrofolate reductase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» B. Dihydrofolate reductase | |
| 4. |
CTP is formed from UTP by the action of ____________ |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» E. | |
| 5. |
Phosphorylation of AMP to ADP is promoted by ____________ |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» B. Aspartate transcarbamoylase | |
| 6. |
In the first committed step of pyrimidine biosynthesis, the reaction is catalyzed by ____________ |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» C. Dihyhroorotase | |
| 7. |
Which of the following is an important precursor in pyrimidine pathway? |
| A. | Glycine |
| B. | Aspartate |
| C. | Glutamine |
| D. | Leucine |
| Answer» C. Glutamine | |
| 8. |
Which of the following is an important precursor in the purine pathway? |
| A. | Glycine |
| B. | Aspartate |
| C. | Glutamine |
| D. | Leucine |
| Answer» B. Aspartate | |
| 9. |
The first intermediate with a complete purine ring is ____________ |
| A. | Inosinate |
| B. | Formate |
| C. | Aspartate |
| D. | Glycine |
| Answer» B. Formate | |
| 10. |
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 |
| Answer» B. 4-phosphoribosylamine | |
| 11. |
ADENOSINE_DEAMINASE_DEAMINATES_ADENOSINE_TO?$ |
| A. | Hypoxanthine |
| B. | Inosine |
| C. | Xanthine |
| D. | Guanosine |
| Answer» C. Xanthine | |
| 12. |
Which_of_the_following_is_degraded_to_methylmalonylsemialdehyde?$ |
| A. | Glutamine |
| B. | Tyrosine |
| C. | Thymine |
| D. | Leucine |
| Answer» D. Leucine | |
| 13. |
Conversion of dUMP to dTMP is catalyzed b? |
| A. | Thymidylate synthase |
| B. | Dihydrofolate reductase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» B. Dihydrofolate reductase | |
| 14. |
CTP is formed from UTP by the action of |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» E. | |
| 15. |
Phosphorylation of AMP to ADP is promoted by |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» B. Aspartate transcarbamoylase | |
| 16. |
In the first committed step of pyrimidine biosynthesis, the reaction is catalyzed by |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» C. Dihyhroorotase | |
| 17. |
Which of the following is an important precursor in purine pathway? |
| A. | Glycine |
| B. | Aspartate |
| C. | Glutamine |
| D. | Leucine |
| Answer» B. Aspartate | |
| 18. |
The first intermediate with a complete purine ring is |
| A. | Inosinate |
| B. | Formate |
| C. | Aspartate |
| D. | Glycine |
| Answer» B. Formate | |
| 19. |
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 |
| Answer» B. 4-phosphoribosylamine | |