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July 3, 2015

Homework Help: Biology - oxidative phosphorylation

Posted by JJ on Wednesday, April 23, 2008 at 11:35am.

Some things I don't understand:

If oxygen accepts electrons from the electron transport chain, how does it become a molecule of water? ie where does the hydrogen come from?

In chemiosmosis, protons are pumped against their concentration gradient across the inner mitochondrial membrane to create a pH gradient which then powers ATP synthesis. But doesn't the initial pumping out of protons use ATP?

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