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

Citrate synthease
Cytochrome bc1 complex
NADH dehydrogenase
Cytochrome oxidase

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

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

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