TCA Cycle
Which one is not the main protein in electron transport chain?

NADH dehydrogenase
Cytochrome bc1 complex
Cytochrome oxidase
Citrate synthease

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TCA Cycle
Most multi-cellular organisms obtain energy for the synthesis of ATP during oxidative phosphorylation from

high energy phosphate compounds
a proton gradient across the cell membrane
a proton gradient across the outer mitochondrial membrane
a proton gradient across the inner mitochondrial membrane

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