Biochemistry Final Exam 1st Attempt 2023
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Questions and Answers

Why is the affinity of fetal hemoglobin for oxygen higher than that of adult hemoglobin?

  • The Bohr effect is enhanced in the fetus
  • The tense form of hemoglobin is more prevalent in the circulation of the fetus
  • There is less 2,3-BPG in the fetal circulation as compared to maternal circulation (correct)
  • Fetal hemoglobin cannot bind 2,3-BPG effectively

    • Which amino acid is rich in protein and provides the greatest buffering capacity at physiologic pH?

  • Histidine (correct)
  • Serine
  • Arginine
  • Lysine

    • What could explain a farmer's bluish skin coloring and methemoglobin levels of 20%?

  • Carbon monoxide poisoning
  • Nitrates in well water (correct)
  • Cyanide poisoning
  • Lack of vitamin E in the diet

    • Which amino acid cannot be found in proteins?

    <p>β-alanine</p> Signup and view all the answers

    What characteristic of glycine accounts for its use as the initial amino acid in the collagen repeat Gly-X-Y?

    <p>Flexibility due to small side chain</p> Signup and view all the answers

    What is the rate-limiting enzyme in catecholamines biosynthesis?

    <p>Tyrosine hydroxylase</p> Signup and view all the answers

    Which amino acid's side chain permits it to gain or lose a proton, thus contributing to its buffering capacity at physiologic pH?

    <p>Arginine</p> Signup and view all the answers

    What does enzymatic reaction velocity depend on?

    <p>Temperature, PH and substrate concentrations</p> Signup and view all the answers

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