How many protons are translocated across the inner mitochondrial membrane by complex III for each pair of electrons passing through the electron transport chain?
A)0
B)1
C)2
D)4

Question

Quizplus · Accepted Answer

Complex III of the electron transport chain, also known as the cytochrome bc1 complex or ubiquinol-cytochrome c oxidoreductase, translocates 4 protons across the inner mitochondrial membrane for each pair of electrons that pass through it. This contributes to the proton gradient used by ATP synthase to generate ATP.

How Many Protons Are Translocated Across the Inner Mitochondrial Membrane