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MCQs

Total Questions : 193 | Page 5 of 20 pages
Question 41. The vitamin riboflavin is part of the __________ molecule.
  1.    ferredoxin
  2.    FAD
  3.    pyridoxal phosphat
  4.    pyrophosphate
 Discuss Question
Answer: Option B. -> FAD
Answer: (b).FAD
Question 42. The most prominent role that tocopherol has in in-vitro systems is as a strong
  1.    antioxidants
  2.    reducing agent
  3.    oxidizing agent
  4.    all of these
 Discuss Question
Answer: Option A. -> antioxidants
Answer: (a).antioxidants
Question 43. Biotin occurs mainly in combined forms bound to protein through
  1.    ε-N-lysine moiety
  2.    ε-S-lysine moiety
  3.    ε-N-biotinyl-L-lysine
  4.    ε-N-lipoyl - L-lysine
 Discuss Question
Answer: Option A. -> ε-N-lysine moiety
Answer: (a).ε-N-lysine moiety
Question 44. β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by
  1.    plants
  2.    animal
  3.    plants and animals both
  4.    none of these
 Discuss Question
Answer: Option A. -> plants
Answer: (a).plants
Question 45. Lipoic acid is a co-factor of the
  1.    pyruvic dehydrogenase
  2.    α-ketoglutaric dehydrogenase
  3.    both (a) and (b)
  4.    di-hydroorotate dehydrogenase
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 46. How is the enzyme COX-1 important in human health?
  1.    It helps to transport carbon dioxide in the blood
  2.    It is critical for the biosynthesis of DNA
  3.    It is a chemical derivative of aspirin
  4.    It catalyzes the production of hormones that maintain the stomach lining
 Discuss Question
Answer: Option D. -> It catalyzes the production of hormones that maintain the stomach lining
Answer: (d).It catalyzes the production of hormones that maintain the stomach lining
Question 47. Which of the following is false statement with regard to comparison between Serine and HIV proteases?
  1.    Both use nucleophilic attack to hydrolyze the peptide bond
  2.    Both require water to complete the catalytic cycle
  3.    Both forms an acyl-enzyme intermediate
  4.    Both show specificity for certain amino acid sequences
 Discuss Question
Answer: Option C. -> Both forms an acyl-enzyme intermediate
Answer: (c).Both forms an acyl-enzyme intermediate
Question 48. The proteolysis rate enhancement by chymotrypsin (~10¹⁰ folds) corresponds to a reduction in activation energy of about
  1.    40 kJ/mol
  2.    49 kJ/mol
  3.    58 kJ/mol
  4.    88 kJ/mol
 Discuss Question
Answer: Option C. -> 58 kJ/mol
Answer: (c).58 kJ/mol
Question 49. In the enzyme-catalyzed reaction shown below, what will be the effect on substances A, B, C, and D of inactivating the enzyme labeled E2?
A ---(E1)---> B ---(E2)---> C ---(E3)--->
  1.    A, B, C, and D will all still be produced
  2.    A, B, and C will still be produced, but not D
  3.    A and B will still be produced, but not C or D
  4.    A will still be produced, but not B, C, or D
 Discuss Question
Answer: Option C. -> A and B will still be produced, but not C or D
Answer: (c).A and B will still be produced, but not C or D
Question 50. The nucleophile in serine proteases is
  1.    Serine
  2.    water
  3.    both (a) and (b)
  4.    Asparagine
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)

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