Electron Carriers: NAD+ and FAD
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NAD+ and FAD are electron-carrier molecules, derived from B vitamins, that accept high-energy electrons to become NADH and FADH2 for later energy use.
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NADH, the reduced form of NAD+, carries electrons from glycolysis onward to the electron transport chain.
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A carrier's reduced form, marked by the added "H," holds the energy — its oxidized form must be regenerated.