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Electron transport chain - CORRECT ANSWER-occurs in the inner mitochondrial membrane and involves a series of reactions that shuttle electrons from NADH and FADH2 to molecular oxygen. This results in the pumping of protons from the mitochondrial matrix into the mitochondrial intermembrane space and oxygen is reduced to form water. The H+ ions (protons) are pumped into the mitochondrial matrix through the ATP synthase enzyme, which uses the force of H+ ions flowing through it to phosphoryla...