Think you know energy coupling?
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Questions and Answers

Which of the following is true about the binding change mechanism of energy coupling?

  • The irregularly shaped shaft is linked to F1 instead of Fo
  • Each β subunit is in the same stage of the catalytic cycle at any time
  • The open conformation favors ATP release (correct)
  • The rotation is driven by the flow of O2 through Fo

    • What is the role of the irregularly shaped shaft in the binding change mechanism of energy coupling?

  • It catalyzes the formation of ATP
  • It links Fo to F1 (correct)
  • It rotates relative to the ring of 3 α subunits
  • It is stationary and does not rotate

    • What drives the rotation of the irregularly shaped shaft in the binding change mechanism of energy coupling?

  • The flow of CO2 through Fo
  • The flow of O2 through Fo
  • The flow of H+ through Fo (correct)
  • The flow of glucose through Fo

    • What happens to the conformation of each β subunit in the binding change mechanism of energy coupling?

    <p>They change conformation sequentially as they interact with the rotating shaft</p> Signup and view all the answers

    What is the function of the loose conformation of the β subunit in the binding change mechanism of energy coupling?

    <p>To loosely bind ADP + Pi</p> Signup and view all the answers

    What is the function of the tight conformation of the β subunit in the binding change mechanism of energy coupling?

    <p>To tightly bind substrates and form ATP</p> Signup and view all the answers

    What is the function of the open conformation of the β subunit in the binding change mechanism of energy coupling?

    <p>To favor ATP release</p> Signup and view all the answers

    How many β subunits are in the ring in the binding change mechanism of energy coupling?

    <p>3</p> Signup and view all the answers

    Which of the following is true about the binding change mechanism of energy coupling?

    <p>The open conformation favors ATP release</p> Signup and view all the answers

    What is the role of the irregularly shaped shaft in the binding change mechanism of energy coupling?

    <p>It links Fo to F1</p> Signup and view all the answers

    What drives the rotation of the irregularly shaped shaft in the binding change mechanism of energy coupling?

    <p>The flow of H+ through Fo</p> Signup and view all the answers

    What happens to the conformation of each β subunit in the binding change mechanism of energy coupling?

    <p>They change conformation sequentially as they interact with the rotating shaft</p> Signup and view all the answers

    What is the function of the loose conformation of the β subunit in the binding change mechanism of energy coupling?

    <p>To loosely bind ADP + Pi</p> Signup and view all the answers

    What is the function of the tight conformation of the β subunit in the binding change mechanism of energy coupling?

    <p>To tightly bind substrates and form ATP</p> Signup and view all the answers

    What is the function of the open conformation of the β subunit in the binding change mechanism of energy coupling?

    <p>To favor ATP release</p> Signup and view all the answers

    How many β subunits are in the ring in the binding change mechanism of energy coupling?

    <p>3</p> Signup and view all the answers

    Which part of Fo is proposed to rotate relative to the ring of 3 β subunits?

    <p>An irregularly shaped shaft</p> Signup and view all the answers

    What drives the rotation of the irregularly shaped shaft linked to Fo?

    <p>The flow of H+</p> Signup and view all the answers

    What changes sequentially as each β subunit interacts with the rotating shaft?

    <p>The conformation of each β subunit</p> Signup and view all the answers

    In what stage of the catalytic cycle is each β subunit in the loose conformation?

    <p>When the active site can loosely bind ADP + Pi</p> Signup and view all the answers

    What is the tight conformation of each β subunit?

    <p>When ATP is formed</p> Signup and view all the answers

    What favors ATP release in each β subunit?

    <p>The open conformation</p> Signup and view all the answers

    How many β subunits make up the ring that the irregularly shaped shaft linked to Fo rotates relative to?

    <p>3</p> Signup and view all the answers

    What is the proposed mechanism of energy coupling in Fo?

    <p>The binding change mechanism</p> Signup and view all the answers

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