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Problem : What is the name of the enzyme responsible for catalyzing the oxidative phosphorylation reaction that synthesizes ATP?

Proton translocating ATP synthase

Problem : How many electrons must pass through the electron transport chain in order to synthesize one molecule of ATP?

A minimum of two electrons.

Problem : Where does the energy to drive ATP synthesis by oxidative phosphorylation come from?

The energy to drive ATP synthesis by oxidative phosphorylation comes from the energy harnessed in the electron transport chain and the electrochemical gradient established across the inner mitochondrial membrane.
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