| Definition: Biomolecular machinery present in prokaryotic membranes and eukaryotic mitochnodria that couples the flow of electrons to proton pumps in order to convert energy from sugar to ATP.
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The electron transport chain couples the transfer of an electron from NADH to molecular oxygen (O2) with the pumping of protons (H+) across a membrane. The charge gradient that results across the membrane serves as a battery to drive ATP Synthase.
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