Hemoglobin Structure and Function
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Questions and Answers

Which element in the heme moiety of hemoglobin binds to oxygen?

  • Zinc
  • Magnesium
  • Iron (correct)
  • Copper

    • What is the molecular weight of hemoglobin?

  • 50,000
  • 64,450 (correct)
  • 75,825
  • 40,100

    • In normal adult human hemoglobin (hemoglobin A), how many pairs of polypeptides are there in each molecule?

  • 3
  • 4
  • 6
  • 2 (correct)

    • What causes a decrease in the affinity of hemoglobin for oxygen?

    <p>An increase in the concentration of 2,3-BPG (B)</p> Signup and view all the answers

    When blood is exposed to oxidizing agents, what change occurs to the iron in hemoglobin?

    <p>It is converted to ferric iron (Fe3+) (D)</p> Signup and view all the answers

    What happens when methemoglobin is present in large quantities in the circulation?

    <p>Causes a dusky discoloration of the skin resembling cyanosis (A)</p> Signup and view all the answers

    What enzyme system in red cells converts methemoglobin back to hemoglobin?

    <p>NADH-methemoglobin reductase system (D)</p> Signup and view all the answers

    What is the consequence of carbon monoxide reacting with hemoglobin?

    <p>Forms carboxyhemoglobin which displaces O2 on hemoglobin (D)</p> Signup and view all the answers

    Where is most of the biliverdin converted in humans and excreted?

    <p>Converted to bilirubin and excreted in the bile (B)</p> Signup and view all the answers

    For what condition can phototherapy be used effectively according to the text?

    <p>Jaundice due to hemolysis in infants (B)</p> Signup and view all the answers

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