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Free energy change during electron transport

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Description
The overall energy drop ([198]G) for electrons traveling from NADH to oxygen is 53 kcal/mol, but this “fall” is broken up into a series of smaller steps by the electron transport chain. (An oxygen atom is represented here as 1?2 O2 to emphasize that the electron transport chain reduces molecular oxygen, O2, not individual oxygen atoms. For every 2 NADH molecules, 1 O2 molecule is reduced to 2 H2O.)
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