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

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

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

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