TCA Cycle
Why is the TCA cycle the central pathway of metabolism of the cell?

None of the above
All other metabolic pathways depend upon it
It occurs in the center of the cell
Its intermediates are commonly used by other metabolic reactions

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

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