When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
A) The pH of the matrix increases.
B) ATP synthase pumps protons by active transport.
C) The electrons gain free energy.
D) The cytochromes phosphorylate ADP to form ATP.
E) NAD⁺ is oxidized.

Question

Quizplus · Accepted Answer

The flow of electrons through the electron transport chain in mitochondria leads to the pumping of protons (H+) from the matrix into the intermembrane space, creating a proton gradient. As protons flow back into the matrix through ATP synthase, the pH of the matrix increases due to the reduction in proton concentration.

When Electrons Flow Along the Electron Transport Chains of Mitochondria