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Question 18.6: ATP Synthesis Why does the oxidation of NADH provide energy ...

ATP Synthesis

Why does the oxidation of NADH provide energy for the formation of three ATP whereas FADH_2 produces two ATP?

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Electrons from the oxidation of NADH enter electron transport at complex I. They pass through three complexes (I, III, and IV) pumping H^+ ions into the intermembrane space. Electrons from FADH_2 enter electron transport at complex II, pumping H^+ ions through only two complexes (III and IV) that pump H^+ ions.

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