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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 (B)</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 (A)</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 (D)</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 (D)</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 (B)</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 (A)</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 (B)</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 (D)</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 (C)</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 (B)</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 (C)</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 (A)</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 (D)</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 (A)</p> Signup and view all the answers

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

<p>The flow of H+ (B)</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 (C)</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 (C)</p> Signup and view all the answers

What is the tight conformation of each β subunit?

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

What favors ATP release in each β subunit?

<p>The open conformation (C)</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 (D)</p> Signup and view all the answers

What is the proposed mechanism of energy coupling in Fo?

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

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