MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 132 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When the amino acid alanine (R-group is CH) is added to a solution with a pH of 7.3, alanine becomes |
| A. | a cation |
| B. | nonpolar |
| C. | a zwitterions |
| D. | an isotope |
| Answer» D. an isotope | |
| 2. |
The sulphur containing side chain of cysteine is |
| A. | ampiphillic, highly reactive and capable of reacting with another cysteine |
| B. | hydrophillc, highly reactive and capable of reacting with another cysteine |
| C. | hydrophobic, highly reactive and capable of reacting with another cysteine |
| D. | none of the above |
| Answer» D. none of the above | |
| 3. |
The sequence of letters 'WYQN' will represent |
| A. | Tryptophan, tyrosine, glutamic acid, asparagine |
| B. | Tryptophan, tyrosine, glutamine, asparagine |
| C. | Tryptophan, glutamine, tryptophan, asparagine |
| D. | Glutamine, tyrosine, tryptophan, aspartic acid |
| Answer» C. Tryptophan, glutamine, tryptophan, asparagine | |
| 4. |
An intermediate of the citric acid cycle that undergoes reductive amination with glutamine as nitrogen donor is |
| A. | α-ketoglutarate |
| B. | Glutamine |
| C. | NADPH |
| D. | H⁺ |
| Answer» B. Glutamine | |
| 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. |
A second amino group is transferred to cituilline from |
| A. | Aspartate |
| B. | Glutamate |
| C. | Alanine |
| D. | Guanine |
| Answer» B. Glutamate | |
| 7. |
The cyclized derivative of glutamate is |
| A. | Proline |
| B. | Arginine |
| C. | Glutamine |
| D. | Serine |
| Answer» B. Arginine | |
| 8. |
Which of the following produce pyruvate? |
| A. | Leucine |
| B. | Isoleucine |
| C. | Lysine |
| D. | Alanine |
| Answer» E. | |
| 9. |
Which of the following is a non-essential amino acid? |
| A. | Methionine |
| B. | Threonine |
| C. | Lysine |
| D. | Cysteine |
| Answer» E. | |
| 10. |
Glutamine is converted to glutamate and NH₄⁺ by |
| A. | Amino transferases |
| B. | Glutaminase |
| C. | Glutamine synthase |
| D. | Glutamate dehydrogenase |
| Answer» C. Glutamine synthase | |
| 11. |
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 | |
| 12. |
Pyridoxal phosphate and its aminate form, pyridoxamine phosphate are tightly bound coenzymes of |
| A. | Amino transferases |
| B. | Glutaminase |
| C. | Glutamine synthase |
| D. | Glutamate dehydrogenase |
| Answer» B. Glutaminase | |
| 13. |
Conversion of dUMP to dTMP is catalyzed by |
| A. | Thymidylate synthase |
| B. | Dihydrofolate reductase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» B. Dihydrofolate reductase | |
| 14. |
The carbon atom source while producing urea in the urea cycle is |
| A. | CO₂ |
| B. | Glucose |
| C. | Aspartic acid |
| D. | Arginine |
| Answer» B. Glucose | |
| 15. |
The first intermediate in cholesterol synthesis is |
| A. | Mevalonate |
| B. | Isoprene |
| C. | Squalene |
| D. | Ethylene |
| Answer» B. Isoprene | |
| 16. |
Generally the receptors for steroid hormones reside at |
| A. | Nucleoplasm |
| B. | Nuclear membrane |
| C. | Cytoplasm |
| D. | Plasma membrane |
| Answer» B. Nuclear membrane | |
| 17. |
Conversion of nitrogen to ammonia or nitrogenous compounds is termed as |
| A. | Nitrogen fixation |
| B. | Nitrification |
| C. | Denitrification |
| D. | Nitrogen assimilation |
| Answer» B. Nitrification | |
| 18. |
3-phosphoglycerate is not the metabolic precursor for |
| A. | Serine |
| B. | Glycine |
| C. | Cysteine |
| D. | Arginine |
| Answer» E. | |
| 19. |
Which of the following yield acetyl co-A via aceto-acetyl co-A? |
| A. | Leucine |
| B. | Isoleucine |
| C. | Threonine |
| D. | Alanine |
| Answer» B. Isoleucine | |
| 20. |
Free ammonia combined with glutamate to yield glutamine by the action of |
| A. | Glutaminase |
| B. | Glutamine synthase |
| C. | Glutamate dehydrogenase |
| D. | Amino transferase |
| Answer» C. Glutamate dehydrogenase | |
| 21. |
Lignin is derived from |
| A. | Phenylalanine |
| B. | Valine |
| C. | Tryptophan |
| D. | Arginine |
| Answer» B. Valine | |
| 22. |
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 | |
| 23. |
Glutamate is metabolically converted to α-ketoglutarate and NH₄⁺ by a process |
| A. | Oxidative deamination |
| B. | Transamination |
| C. | Reductive deamination |
| D. | Deamination |
| Answer» B. Transamination | |
| 24. |
Which of the following is the integral membrane protein of smooth ER? |
| A. | Thiolase |
| B. | HMG co-A synthase |
| C. | HMG co-A reductase |
| D. | Pyruvate kinase |
| Answer» D. Pyruvate kinase | |
| 25. |
Which of the following gives rise to methionine, threonine and lysine? |
| A. | Pyruvate |
| B. | Glutamate |
| C. | Aspartate |
| D. | Serine |
| Answer» D. Serine | |
| 26. |
The branched chain amino acid is not |
| A. | Leucine |
| B. | Isoleucine |
| C. | Valine |
| D. | Alanine |
| Answer» E. | |
| 27. |
The first amino group entering into urea cycle is |
| A. | Carbomyl phosphate |
| B. | Ornithine |
| C. | Cituilline |
| D. | Argininosuccinate |
| Answer» B. Ornithine | |
| 28. |
The first step in the catabolism of most L-amino acids once they have reached the liver is promoted by |
| A. | Amino transferases |
| B. | Glutaminase |
| C. | Glutamine synthase |
| D. | Glutamate dehydrogenase |
| Answer» B. Glutaminase | |
| 29. |
The necessary coenzyme for transamination reactions is |
| A. | Pyridoxal phosphate |
| B. | Thiamine pyrophosphate |
| C. | NAD |
| D. | Coenzyme A |
| Answer» B. Thiamine pyrophosphate | |
| 30. |
Which of the following are exclusively glucogenic? |
| A. | Arginine |
| B. | Leucine |
| C. | Lysine |
| D. | Threonine |
| Answer» B. Leucine | |
| 31. |
The reaction of glutamate and NH₄⁺ to yield glutamine is catalyzed by |
| A. | Uridylyltransferase |
| B. | Adenylyltransferase |
| C. | Glutamate synthase |
| D. | Glutamine synthase |
| Answer» E. | |
| 32. |
Which of the following yield acetyl coA directly? |
| A. | Phenylalanine |
| B. | Isoleucine |
| C. | Lysine |
| D. | Alanine |
| Answer» C. Lysine | |
| 33. |
Almost 85 % of produced millions of tones of ammonia (NH₃) is used for making |
| A. | glass |
| B. | fertilizers |
| C. | urea |
| D. | nitrogen |
| Answer» C. urea | |
| 34. |
Steroids have ______________ |
| A. | Sterol nucleus with two alkyl chain attached to the ring D of cholesterol |
| B. | Sterol nucleus with two CH₃ between C and D ring and A and B ring of cholesterol |
| C. | Sterol nucleus without CH₃ between C ring and D ring of cholesterol |
| D. | Sterol nucleus but lack the alkyl chain attached to the ring D of cholesterol |
| Answer» E. | |
| 35. |
Which of the following is a PLP-requiring enzyme? |
| A. | Ornithine decarboxylase |
| B. | Glutathione peroxidase |
| C. | Glutamine synthase |
| D. | Glutamate synthase |
| Answer» B. Glutathione peroxidase | |
| 36. |
Formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds is called as |
| A. | Nitrogen fixation |
| B. | Nitrification |
| C. | Denitrification |
| D. | Nitrogen assimilation |
| Answer» E. | |
| 37. |
How many carbons are present in geranyl pyrophosphate? |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 11 |
| Answer» D. 11 | |
| 38. |
A person suffering from phenylketonuria on consumption food containing high phenylalanine may lead to the accumulation of |
| A. | phenylalanine |
| B. | phenylpyruvate |
| C. | tyrosine |
| D. | isoleucine |
| Answer» C. tyrosine | |
| 39. |
Transamination is the transfer of an amino |
| A. | acid to a carboxylic acid plus ammonia |
| B. | group from an amino acid to a keto acid |
| C. | acid to a keto acid plus ammonia |
| D. | group from an amino acid to a carboxylic acid |
| Answer» C. acid to a keto acid plus ammonia | |
| 40. |
Histidine is degraded to α-ketoglutarate and is described as a |
| A. | gluco amino acid |
| B. | glucogenic amino acid |
| C. | ketogenic amino acid |
| D. | keto-gluco amino acid |
| Answer» C. ketogenic amino acid | |
| 41. |
Which of the following is degraded to methylmalonylsemialdehyde? |
| A. | Glutamine |
| B. | Tyrosine |
| C. | Thymine |
| D. | Leucine |
| Answer» D. Leucine | |
| 42. |
Which of the following produce oxaloacetate? |
| A. | Aspartate |
| B. | Isoleucine |
| C. | Threonine |
| D. | Alanine |
| Answer» B. Isoleucine | |
| 43. |
Which of the following gives rise to γ-amino butyrate? |
| A. | Glutamate synthase |
| B. | Glutamate decarboxylation |
| C. | Glutamine synthase |
| D. | Pyruvate decarboxylation |
| Answer» C. Glutamine synthase | |
| 44. |
Glutathione peroxidase contains a covalently bound |
| A. | Selenium atom |
| B. | Calcium atom |
| C. | Magnesium atom |
| D. | Copper atom |
| Answer» B. Calcium atom | |
| 45. |
Which of the following is the precursor for auxin? |
| A. | Phenylalanine |
| B. | Valine |
| C. | Tryptophan |
| D. | Arginine |
| Answer» D. Arginine | |
| 46. |
Which of the following is not an aromatic amino acid? |
| A. | Phenylalanine |
| B. | Tyrosine |
| C. | Tryptophan |
| D. | Leucine |
| Answer» E. | |
| 47. |
Tyrosine gives rise to a family of catecholamines that does not include |
| A. | Dopamine |
| B. | Norepinephrine |
| C. | Epinephrine |
| D. | Cortisol |
| Answer» E. | |
| 48. |
The reaction vessel of ammonia (NH₃) production is composed of |
| A. | 400-500 temperature |
| B. | 25-300 atm pressure |
| C. | iron |
| D. | all of above |
| Answer» E. | |
| 49. |
Nitric acid (HNO₃) is made from |
| A. | ammonium |
| B. | nitrogen |
| C. | nitrate |
| D. | ammonia |
| Answer» E. | |
| 50. |
In car engine, the fuel is in compressed form and ignited by |
| A. | key |
| B. | spark |
| C. | accelerator |
| D. | brake |
| Answer» C. accelerator | |