Protein Folding and Quaternary Structure Quiz
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Questions and Answers

What is the percentage of O2 saturation in hemoglobin at the O2 pressure in the lung alveoli?

  • 50%
  • 66%
  • 32%
  • 100% (correct)
  • In active muscle, at what percentage is hemoglobin saturated with O2?

  • 32% (correct)
  • 100%
  • 50%
  • 66%
  • How much of their bound O2 molecules do hemoglobin molecules give up during each passage through the circulation?

  • 100%
  • 50%
  • 66% (correct)
  • 32%
  • What does positive cooperativity improve in terms of O2 delivery?

    <p>O2 delivery efficiency</p> Signup and view all the answers

    What structural modification occurs between the α and ß subunits of hemoglobin tetramer during cooperative binding?

    <p>Increase in contacts</p> Signup and view all the answers

    What stabilizes the structure of deoxyhemoglobin during O2 binding?

    <p>Salt-bridge contacts between α and β chains</p> Signup and view all the answers

    What happens to the heme group's iron during O2 binding?

    <p>It pulls directly into the heme plane</p> Signup and view all the answers

    What changes shape within the subunit during O2 binding?

    <p>'T' helix</p> Signup and view all the answers

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