MCQOPTIONS
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MCQOPTIONS
This section includes 49 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Vitamin B (Cobalamin) is only synthesized by |
| A. | fishes |
| B. | micro-organisms |
| C. | plants |
| D. | animals |
| Answer» C. plants | |
| 2. |
Vitamin B is useful in the prevention and treatment of |
| A. | pernicious anemia |
| B. | scurvy |
| C. | cataract |
| D. | beri-beri |
| Answer» B. scurvy | |
| 3. |
The most prominent role that tocopherol has in systems is as a strong |
| A. | antioxidants |
| B. | reducing agent |
| C. | oxidizing agent |
| D. | all of these |
| Answer» B. reducing agent | |
| 4. |
In the co-enzyme Bthe position occupied by a cyanide ion in vitamin B is bonded directly to the __________ of the ribose of adenosine. |
| A. | adenine |
| B. | 5-6 dimethylbenzimidazole |
| C. | hydroxycobalamin |
| D. | cyanocobalamin |
| Answer» B. 5-6 dimethylbenzimidazole | |
| 5. |
Which of the following compounds/(s) belong/(s) to the vitamin B group? |
| A. | Pyridoxal |
| B. | Pyridoxine |
| C. | Pyridoxamine |
| D. | All of these |
| Answer» E. | |
| 6. |
What metal ion is specifically bound by vitamin B? |
| A. | Cobalt |
| B. | Copper |
| C. | Zinc |
| D. | Iron |
| Answer» B. Copper | |
| 7. |
ACP has its molecular weight as around |
| A. | 9000 |
| B. | 19000 |
| C. | 39000 |
| D. | 90,000 |
| Answer» B. 19000 | |
| 8. |
Vitamin K was first isolated from alfalalfa and has the phytyl side chain consisting of |
| A. | four isoprene units |
| B. | six isoprene units |
| C. | nine isoprene units |
| D. | four isoprene units |
| Answer» B. six isoprene units | |
| 9. |
Lipoic acid exists in |
| A. | oxidized form |
| B. | reduced form |
| C. | oxidized and reduced form both |
| D. | none of these |
| Answer» D. none of these | |
| 10. |
Vitamin B12 is useful in the prevention and treatment of |
| A. | pernicious anemia |
| B. | scurvy |
| C. | cataract |
| D. | beri-beri |
| Answer» B. scurvy | |
| 11. |
In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine. |
| A. | adenine |
| B. | 5-6 dimethylbenzimidazole |
| C. | hydroxycobalamin |
| D. | cyanocobalamin |
| Answer» B. 5-6 dimethylbenzimidazole | |
| 12. |
Vitamin B12 (Cobalamin) is only synthesized by |
| A. | fishes |
| B. | micro-organisms |
| C. | plants |
| D. | animals |
| Answer» C. plants | |
| 13. |
The absence of ascorbic acid in the human diet gives rise to |
| A. | rickets |
| B. | pernicious anemia |
| C. | cataract |
| D. | beri-beri |
| Answer» C. cataract | |
| 14. |
Vitamins are essential because the organism |
| A. | can't synthesize these compounds at all |
| B. | can synthesize these compounds partially |
| C. | can't synthesize these compounds in the adequate amounts |
| D. | none of the above |
| Answer» B. can synthesize these compounds partially | |
| 15. |
Vitamin-C is considered as a |
| A. | water soluble |
| B. | fat soluble |
| C. | fat and water soluble |
| D. | none of these |
| Answer» B. fat soluble | |
| 16. |
The vitamin niacin is part of the __________ molecule. |
| A. | ferredoxin |
| B. | pyridoxal phosphate |
| C. | pyrophosphate |
| D. | NAD |
| E. | <sup>+</sup> |
| Answer» E. <sup>+</sup> | |
| 17. |
Which of these hormones is a catecholamine? |
| A. | Follitropin |
| B. | Norepinephrine |
| C. | Tetraiodothyronine |
| D. | Tetrahydrofolate |
| Answer» C. Tetraiodothyronine | |
| 18. |
E.coli ACP has its molecular weight as around |
| A. | 9000 |
| B. | 19000 |
| C. | 39000 |
| D. | 90,000 |
| Answer» B. 19000 | |
| 19. |
An early sign of retinol deficiencies in man is |
| A. | night blindness |
| B. | keratinization |
| C. | xeropthalmia |
| D. | none of these |
| Answer» B. keratinization | |
| 20. |
What compound of raw egg white causes a syndrome similar to vitamin B deficiency? |
| A. | Avidin |
| B. | Betabindin |
| C. | Ovalbumin |
| D. | Albumin |
| Answer» B. Betabindin | |
| 21. |
The vitamin riboflavin is part of the __________ molecule. |
| A. | ferredoxin |
| B. | FAD |
| C. | pyridoxal phosphat |
| D. | pyrophosphate |
| Answer» C. pyridoxal phosphat | |
| 22. |
The most prominent role that tocopherol has in in-vitro systems is as a strong |
| A. | antioxidants |
| B. | reducing agent |
| C. | oxidizing agent |
| D. | all of these |
| Answer» B. reducing agent | |
| 23. |
An enzyme, L-folate reductase reduces folic acid to |
| A. | hydrofolic acid |
| B. | dihydrofolic acid |
| C. | trihydrofolic acid |
| D. | tetrahydrofolic acid |
| Answer» C. trihydrofolic acid | |
| 24. |
Biotin occurs mainly in combined forms bound to protein through |
| A. | -N-lysine moiety |
| B. | -S-lysine moiety |
| C. | -N-biotinyl-L-lysine |
| D. | -N-lipoyl - L-lysine |
| Answer» B. -S-lysine moiety | |
| 25. |
Lipoic acid is a co-factor of the |
| A. | pyruvic dehydrogenase |
| B. | -ketoglutaric dehydrogenase |
| C. | both (a) and (b) |
| D. | di-hydroorotate dehydrogenase |
| Answer» D. di-hydroorotate dehydrogenase | |
| 26. |
-carotene together with -carotene, -carotene and cryptoxanthine are synthesized by |
| A. | plants |
| B. | animal |
| C. | plants and animals both |
| D. | none of these |
| Answer» B. animal | |
| 27. |
The symptoms of retinol excess are |
| A. | bone fragility |
| B. | nausea |
| C. | weakness |
| D. | all of these |
| Answer» E. | |
| 28. |
Main function of insulin hormone is to |
| A. | increase glycogen in liver |
| B. | decrease glycogen in liver |
| C. | increase blood sugar |
| D. | decrease blood sugar |
| Answer» E. | |
| 29. |
A deficiency of thiamin produces the disease known as |
| A. | beri-beri |
| B. | scurvy |
| C. | cataract |
| D. | anemia |
| Answer» B. scurvy | |
| 30. |
Acyl carrier protein (ACP) plays an important role in the biosynthesis of |
| A. | fatty acids |
| B. | amino acids |
| C. | sugars |
| D. | carbohydrates |
| Answer» B. amino acids | |
| 31. |
The occurrence of metals such as iron or molybdenum in some flavoproteins can |
| A. | stabilize the semiquinone |
| B. | de-stabilize the semiquinone |
| C. | form chelation |
| D. | all of these |
| Answer» B. de-stabilize the semiquinone | |
| 32. |
A deficiency of niacin causes |
| A. | pellagra |
| B. | scurvy |
| C. | cataract |
| D. | anemia |
| Answer» B. scurvy | |
| 33. |
Selenium is an essential component of the enzyme glutathione peroxidase which |
| A. | scavenges toxic hydoperoxycompounds in tissues |
| B. | reduces toxic hydoperoxycompounds in tissues |
| C. | oxidizes toxic hydoperoxycompounds in tissues |
| D. | none of the above |
| Answer» B. reduces toxic hydoperoxycompounds in tissues | |
| 34. |
Who discovered vitamin C (ascorbic acid)? |
| A. | Paul Berg |
| B. | Linus Pauling |
| C. | Albert Szent-Gyorgyi |
| D. | Kerry Mull is |
| Answer» D. Kerry Mull is | |
| 35. |
Which of these is a vitamin A precursor? |
| A. | Cobalamin |
| B. | Pyridoxine |
| C. | Beta-Carotene |
| D. | Thiamine |
| Answer» D. Thiamine | |
| 36. |
Which of these molecules is vitamin H? |
| A. | Biotin |
| B. | Carnitine |
| C. | Folic acid |
| D. | None of these |
| Answer» B. Carnitine | |
| 37. |
Vitamin-D deficiency can cause |
| A. | rickets |
| B. | pernicious anemia |
| C. | cataract |
| D. | beri-beri |
| Answer» B. pernicious anemia | |
| 38. |
A deficiency of Vitamin K results in a decreased level of |
| A. | prothrombin |
| B. | thrombin |
| C. | fibrin |
| D. | fibrinogen |
| Answer» B. thrombin | |
| 39. |
The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become |
| A. | colorless on reduction with Zn in acid and regained its color on re-oxidation |
| B. | colorless on oxidation and regained its color on reduction with Zn in acid |
| C. | more deep in color on reduction with Zn in acid and regained its color on re-oxidation |
| D. | more deep in color on oxidation and regained its color on reduction with Zn in acid |
| Answer» B. colorless on oxidation and regained its color on reduction with Zn in acid | |
| 40. |
Which of the following compounds/(s) belong/(s) to the vitamin B6 group? |
| A. | Pyridoxal |
| B. | Pyridoxine |
| C. | Pyridoxamine |
| D. | All of these |
| Answer» E. | |
| 41. |
What metal ion is specifically bound by vitamin B12? |
| A. | Cobalt |
| B. | Copper |
| C. | Zinc |
| D. | Iron |
| Answer» B. Copper | |
| 42. |
Ascorbic acid acts as an |
| A. | reducing agent |
| B. | oxidizing agent |
| C. | oxidizing and reducing agent both |
| D. | none of the above |
| Answer» B. oxidizing agent | |
| 43. |
Which of these is a symptom of vitamin A deficiency? |
| A. | Osteoporosis |
| B. | Impaired taste perception |
| C. | Blindness |
| D. | Impaired blood clotting |
| Answer» D. Impaired blood clotting | |
| 44. |
Dihydroorotate dehydrogenase contains |
| A. | 4 flavins and 4 atoms of iron per molecule |
| B. | 2 flavins and 4 atoms of iron per molecule |
| C. | 2 flavins and 2 atoms of iron per molecule |
| D. | 4 flavins and 2 atoms of iron per molecule |
| Answer» B. 2 flavins and 4 atoms of iron per molecule | |
| 45. |
A fat-soluble vitamin that regulates blood clotting is |
| A. | vitamin A |
| B. | vitamin K |
| C. | vitamin C |
| D. | niacin |
| Answer» C. vitamin C | |
| 46. |
Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of |
| A. | four isoprene units |
| B. | six isoprene units |
| C. | nine isoprene units |
| D. | four isoprene units |
| Answer» B. six isoprene units | |
| 47. |
Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at |
| A. | both ends by one disulfide bond |
| B. | either end via two disulfide bonds |
| C. | either end via a single disulfide bond |
| D. | both ends by two disulfide bonds |
| Answer» E. | |
| 48. |
An example of a digestive hormone is |
| A. | lipase |
| B. | pepsin |
| C. | amylase |
| D. | gastrin |
| Answer» E. | |
| 49. |
In one iron-metalloflavoprotein, the iron is present as a |
| A. | heme-protein |
| B. | nonheme type |
| C. | both (a) and (b) |
| D. | flavin moiety |
| Answer» B. nonheme type | |