Biochemistry — MCQs

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1. The building blocks of proteins are:





2. The genetic material in most living organisms is:





3. The main energy currency of the cell is:





4. The monomer unit of nucleic acids is:





5. The process of converting glucose to pyruvate is known as:





6. The enzyme that synthesizes DNA is:





7. The enzyme that catalyzes the synthesis of RNA from DNA is:





8. The bond between amino acids in proteins is called:





9. The essential amino acid is:





10. The vitamin that acts as a cofactor in blood clotting is:





11. Hemoglobin is an example of a:





12. The enzyme responsible for lactose digestion is:





13. The secondary structure of proteins is stabilized by:





14. The TCA cycle occurs in the:





15. The end product of glycolysis is:





16. The bond between nucleotides in DNA is:





17. The structure of DNA was proposed by:





18. The enzyme that unwinds DNA is:





19. The primary storage polysaccharide in animals is:





20. The primary storage polysaccharide in plants is:





21. The vitamin required for collagen synthesis is:





22. The first enzyme in glycolysis is:





23. The enzyme responsible for replication of RNA from an RNA template is:





24. The pH at which a protein has no net charge is called:





25. The amino acid that contains a sulfur atom is:





26. The enzyme that synthesizes ATP in oxidative phosphorylation is:





27. The genetic code is:





28. Enzymes are mainly composed of:





29. The enzyme that joins Okazaki fragments is:





30. A holoenzyme consists of:





31. The vitamin B12 contains:





32. The oxygen-carrying pigment in red blood cells is:





33. The enzyme that converts pyruvate to acetyl-CoA is:





34. The enzyme needed for transcription initiation is:





35. The vitamin essential for vision is:





36. Enzyme activity is affected by:





37. The functional unit of heredity is:





38. The energy yield of complete oxidation of one glucose molecule is approximately:





39. The vitamin that prevents scurvy is:





40. The enzyme that converts fibrinogen to fibrin in blood clotting is:





41. The coding sequence in DNA is known as:





42. The non-coding sequence in DNA is known as:





43. The coenzyme derived from niacin is:





44. The coenzyme derived from riboflavin is:





45. The prosthetic group in cytochromes is:





46. The terminal electron acceptor in the electron transport chain is:





47. The enzyme used in PCR is:





48. Which bond stabilizes the double helix structure of DNA?





49. The one-carbon metabolism involves which vitamin?





50. The enzyme responsible for DNA proofreading is:





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