Biochemistry MCQs

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1. Which is the building block of proteins?





2. Which bond joins amino acids in a protein?





3. The primary storage form of glucose in animals is:





4. Which enzyme breaks down starch into maltose?





5. Which vitamin acts as a coenzyme in carboxylation reactions?





6. The main nitrogenous waste product in birds is:





7. Which molecule is the universal energy currency of the cell?





8. The process of glucose breakdown to pyruvate is called:





9. Which element is a component of hemoglobin?





10. The enzyme that converts fibrinogen to fibrin is:





11. DNA replication occurs during which phase of the cell cycle?





12. Which vitamin deficiency causes rickets?





13. The process of synthesis of glucose from non-carbohydrate sources is:





14. The main function of lipase is:





15. Which amino acid is essential for cats?





16. The major plasma protein responsible for maintaining osmotic pressure is:





17. Which enzyme catalyzes the conversion of hydrogen peroxide to water and oxygen?





18. The basic unit of nucleic acids is:





19. Which lipid is a major component of cell membranes?





20. The enzyme responsible for DNA unwinding during replication is:





21. Which coenzyme is derived from niacin?





22. The first step of the Krebs cycle involves:





23. Which hormone promotes glycogen breakdown?





24. The end product of anaerobic glycolysis in muscles is:





25. The enzyme that synthesizes RNA from DNA template is:





26. Which mineral is a cofactor for many enzymes and essential for insulin action?





27. The major site of protein digestion is:





28. The enzyme that converts angiotensin I to angiotensin II is:





29. The genetic material in retroviruses is:





30. Which vitamin functions as an antioxidant?





31. The process of breaking down fatty acids for energy is:





32. The enzyme that catalyzes the rate-limiting step in cholesterol synthesis is:





33. Which molecule carries amino acids to the ribosome during protein synthesis?





34. The main function of chylomicrons is:





35. The normal blood glucose level in most domestic animals is approximately:





36. The urea cycle occurs mainly in the:





37. Which enzyme digests DNA and RNA?





38. The primary end product of purine metabolism in humans is:





39. Which hormone promotes glucose uptake by cells?





40. The enzyme involved in lactose digestion is:





41. The major component of bile salts is derived from:





42. The functional unit of a protein is determined by:





43. Which vitamin is essential for collagen synthesis?





44. The enzyme that adds a new DNA strand during replication is:





45. The hormone that regulates basal metabolic rate is:





46. The main storage form of fat in animals is:





47. Which amino acid contains sulfur?





48. The coenzyme required for carboxylation reactions involving CO₂ fixation is:





49. The enzyme responsible for the digestion of proteins in the stomach is:





50. Which molecule is known as the “reducing power” in biosynthetic reactions?





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