Reduced ubiquinone, generated during the oxidation of NADH, passes its electrons to which of the following?
A) ATP synthase
B) cytochrome c oxidase (complex IV)
C) cytochrome b
D) cytochrome c
E) molecular oxygen

Question

Quizplus · Accepted Answer

Reduced ubiquinone (ubiquinol) passes its electrons to cytochrome b, which is part of Complex III (cytochrome bc1 complex) in the electron transport chain. Reduced CoQ (CoQH₂) diffuses in the lipid phase of the membrane and donates its electrons to complex III, whose principal components are the heme proteins cytochromes b and a non-heme protein, known as the Rieske iron-sulfur protein.

Reduced Ubiquinone, Generated During the Oxidation of NADH, Passes Its