1.What is the source of free energy (G) for moving protons out of the mitochondr

Question

1.What is the source of free energy (G) for moving protons out of the mitochondrial matrix against their concentration and electrical gradients

a.ATP

b.The redox reactions of the electron transport chain

c.Glycolysis

d.Creatine phosphate

2.The F0 base of ATP synthase contains a ring of 12 subunits while the F1 head has 5 different protein subunits in the ratios 3:3:1:1:1. It takes ____ protons for the rotor to make one complete revolution, or _____ protons to make one ATP

a.12, 4

b.12, 2

c.4, 4

d.6, 2

Explanation / Answer

(1) b.The redox reactions of the electron transport chain

Oxidation of reduced equivalents in the electron transport chain is coupled to transport of H+ ions into the intermembrane space.

(2)

a.12, 4

It takes 12 protons for the rotor to make one complete revolution, or 4 protons to make one ATP

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