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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?

8 subunits (C) Signup and view all the answers

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

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

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

UQ (C) Signup and view all the answers

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

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

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

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

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

Oxygen (D) Signup and view all the answers

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

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

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

2 hemes (a and a3) (C) Signup and view all the answers

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

To generate ATP through oxidative phosphorylation (D) Signup and view all the answers

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

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

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

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

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

A lipid-soluble electron carrier (B) Signup and view all the answers

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

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

What is the principal transmembrane protein in Complex III?

The b cytochrome (D) Signup and view all the answers

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

Oxygen (B) Signup and view all the answers

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