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. |
What are the inputs to one cycle of urea cycle? |
| A. | One molecule of CO2, one molecule of ammonia, three molecules of ATP and one molecule of aspartic acid |
| B. | One molecule of urea, one molecule of AMP, two molecules of ADP and one molecule of fumaric acid |
| C. | One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| D. | Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid |
| Answer» B. One molecule of urea, one molecule of AMP, two molecules of ADP and one molecule of fumaric acid | |
| 2. |
Urea cycle converts ___________ |
| A. | Keto acids into amino acids |
| B. | Amino acids into keto acids |
| C. | Ammonia into a less toxic form |
| D. | Ammonia into a more toxic form |
| Answer» D. Ammonia into a more toxic form | |
| 3. |
The carbon atom source while producing urea in the urea cycle is ___________ |
| A. | CO2 |
| B. | Glucose |
| C. | Aspartic acid |
| D. | Arginine |
| Answer» B. Glucose | |
| 4. |
What are the products of urea cycle? |
| A. | One molecule of urea, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| B. | One molecule of urea, one molecule of AMP, two molecules of ADP and one molecule of fumaric acid |
| C. | One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| D. | Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid |
| Answer» C. One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid | |
| 5. |
Nitrogen atoms of urea produced in the urea cycle are derived from ___________ |
| A. | Ammonia and aspartic acid |
| B. | Nitrate |
| C. | Nitrite |
| D. | Ammonia |
| Answer» B. Nitrate | |
| 6. |
A second amino group is transferred to cituilline from ___________ |
| A. | Aspartate |
| B. | Glutamate |
| C. | Alanine |
| D. | Guanine |
| Answer» B. Glutamate | |
| 7. |
The first enzyme in the pathway carbamoyl phosphate synthase I, is allosterically activated by ___________ |
| A. | N-acetylglutamate |
| B. | Acetyl coA |
| C. | Glutamate |
| D. | Carbamoyl phosphate |
| Answer» B. Acetyl coA | |
| 8. |
Which is the first amino group entering into urea cycle? |
| A. | carbamoyl phosphate |
| B. | Ornithine |
| C. | Cituilline |
| D. | Argininosuccinate |
| Answer» B. Ornithine | |
| 9. |
Urea production occurs almost exclusively in ___________ |
| A. | Kidneys |
| B. | Liver |
| C. | Blood |
| D. | Urine |
| Answer» C. Blood | |
| 10. |
UREA_CYCLE_CONVERTS?$ |
| A. | Keto acids into amino acids |
| B. | Amino acids into keto acids |
| C. | Ammonia into a less toxic form |
| D. | Ammonia into a more toxic form |
| Answer» D. Ammonia into a more toxic form | |
| 11. |
Inputs to one cycle of urea cycle are$ |
| A. | One molecule of CO<sub>2</sub>, one molecule of ammonia, three molecule of ATP and one molecule of aspartic acid |
| B. | One molecule of urea, one molecule of AMP, two molecule of ADP and one molecule of fumaric acid |
| C. | One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| D. | Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid |
| Answer» B. One molecule of urea, one molecule of AMP, two molecule of ADP and one molecule of fumaric acid | |
| 12. |
Which of the following is not an essential amino acid? |
| A. | Glycine |
| B. | Leucine |
| C. | Methionine |
| D. | Histidine |
| Answer» B. Leucine | |
| 13. |
The carbon atom source while producing urea in the urea cycle is |
| A. | CO<sub>2</sub> |
| B. | Glucose |
| C. | Aspartic acid |
| D. | Arginine |
| Answer» B. Glucose | |
| 14. |
Products of urea cycle are |
| A. | One molecule of urea, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| B. | One molecule of urea, one molecule of AMP, two molecule of ADP and one molecule of fumaric acid |
| C. | One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| D. | Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid |
| Answer» C. One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid | |
| 15. |
Nitrogen atoms of urea produced in the urea cycle are derived from |
| A. | Ammonia and aspartic acid |
| B. | Nitrate |
| C. | Nitrite |
| D. | Ammonia |
| Answer» B. Nitrate | |
| 16. |
A second amino group is transferred to cituilline from |
| A. | Aspartate |
| B. | Glutamate |
| C. | Alanine |
| D. | Guanine |
| Answer» B. Glutamate | |
| 17. |
The first enzyme in the pathway carbamoyl phosphate synthase I, is allosterically activated by |
| A. | N-acetylglutamate |
| B. | Acetyl coA |
| C. | Glutamate |
| D. | Carbamoyl phosphate |
| Answer» B. Acetyl coA | |
| 18. |
The first amino group entering into urea cycle is |
| A. | Carbomyl phosphate |
| B. | Ornithine |
| C. | Cituilline |
| D. | Argininosuccinate |
| Answer» B. Ornithine | |
| 19. |
Urea production occurs almost exclusively in |
| A. | Kidneys |
| B. | Liver |
| C. | Blood |
| D. | Urine |
| Answer» C. Blood | |