Question

question 16 (1 point)
which of the following proteins in the electron transport chain does not pump protons into the intermembrane space of the mitochondria?
complex i
complex ii
complex iii
complex iv

Explanation:

In the electron transport chain (ETC) of mitochondria, Complex I (NADH - CoQ reductase) pumps protons, Complex III (cytochrome bc₁ complex) pumps protons, and Complex IV (cytochrome c oxidase) pumps protons. Complex II (succinate - CoQ reductase) is involved in passing electrons but does not pump protons into the intermembrane space.

Answer:

B. Complex II