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Where do the electrons that enter the electron transport chain come from?
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Where do the electrons that enter the electron transport chain come from?

User Scoobler
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All of the electrons that enter the transport chain come from NADH and FADH 2​start subscript, 2, end subscript molecules produced during earlier stages of cellular respiration: glycolysis, pyruvate oxidation, and the citric acid cycle.
User Angelo Angeles
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