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In oxidative phosphorylation, which process directly drives the conversion of ADP to ATP by ATP synthase?
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Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation
Oxidative Phosphorylation 1
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In oxidative phosphorylation, how many electrons can one molecule of FADH2 donate to the electron transport chain?
A
4 electrons
B
1 electron
C
0 electrons (FADH2 donates only protons)
D
2 electrons
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Understand that FADH2 is a reduced coenzyme that participates in the electron transport chain by donating electrons.
Recall that each molecule of FADH2 carries a pair of electrons, which it donates to Complex II (succinate dehydrogenase) in the electron transport chain.
Recognize that electrons are transferred in pairs in biological redox reactions, so FADH2 donates 2 electrons, not 1 or 4.
Note that FADH2 does not donate protons directly; instead, it donates electrons which then contribute to the proton gradient indirectly.
Conclude that the number of electrons donated by one molecule of FADH2 to the electron transport chain is 2.
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