In the electron transport chain,

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Quizplus · Accepted Answer

All of the choices are correct. In the electron transport chain, NADH and FADH₂ donate electrons to the chain, which passes them along a series of membrane-bound protein complexes, generating a proton gradient across the inner mitochondrial membrane. This gradient is then used by ATP synthase to synthesize ATP via oxidative phosphorylation. Thus, the electron transport chain both transfers energy to ATP formation and generates a concentration gradient by pumping hydrogen ions.

In the Electron Transport Chain