Electron Transport Chain

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Questions and Answers

What is the result of the energy released by electron transfer from NADH to Q in Complex I?

  • Conformational changes that pump 2 protons from matrix to intermembrane space
  • Conformational changes that pump 6 protons from matrix to intermembrane space
  • Conformational changes that pump 8 protons from matrix to intermembrane space
  • Conformational changes that pump 4 protons from matrix to intermembrane space (correct)

How many protons are pumped for each 2 electrons released by NADH in Complex I?

  • 4 protons (correct)
  • 6 protons
  • 2 protons
  • 3 protons

What is the name of the mechanism by which protons are released in the intermembrane space during the reoxidation of UQH2?

  • Redox loop mechanism (correct)
  • Proton pumping mechanism
  • Proton gradient mechanism
  • Electron transport mechanism

How many subunits are present in the hydrophilic domain of mammalian Complex I?

<p>8 subunits (C)</p> Signup and view all the answers

What is the correct description of the membrane domain of mammalian Complex I?

<p>It consists of 54 trans-membrane helices and 7 subunits (D)</p> Signup and view all the answers

What is the name of the cofactor that is not present in the enzyme Complex I?

<p>UQ (C)</p> Signup and view all the answers

What is the primary function of complexes I, III, and IV in the electron transport chain?

<p>To catalyze redox reactions and pump protons across the mitochondrial membrane (A)</p> Signup and view all the answers

What is the role of cytochrome c in the electron transport chain?

<p>A mobile electron carrier that receives electrons from Coenzyme Q (A)</p> Signup and view all the answers

What is the terminal electron acceptor in the electron transport chain?

<p>Oxygen (D)</p> Signup and view all the answers

What is the net result of the reaction catalyzed by Complex IV?

<p>4cytc (Fe2+) + 4H+ + O2 → 4cytc (Fe3+) + 2 H2O (A)</p> Signup and view all the answers

How many hemes are present in Complex IV: cytochrome c oxidase?

<p>2 hemes (a and a3) (C)</p> Signup and view all the answers

What is the function of the electron transport chain in E. coli?

<p>To generate ATP through oxidative phosphorylation (D)</p> Signup and view all the answers

What is the primary function of the Q cycle in Complex III?

<p>To transfer electrons from CoQ to cytochrome c (B)</p> Signup and view all the answers

What is the role of cytochromes in the electron transport chain?

<p>To function as one-electron transfer agents (C)</p> Signup and view all the answers

What is the role of CoQ in the electron transport chain?

<p>A lipid-soluble electron carrier (B)</p> Signup and view all the answers

What is the net result of the Q cycle in Complex III?

<p>Two molecules of UQH2 are oxidized and two molecules of cytochrome c are reduced (B)</p> Signup and view all the answers

What is the principal transmembrane protein in Complex III?

<p>The b cytochrome (D)</p> Signup and view all the answers

What is the final destination of the electrons from NADH in the electron transport chain?

<p>Oxygen (B)</p> Signup and view all the answers

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