TCA Cycle
Which of the following enzyme does not take part in the TCA cycle?

Malate dehydrogenase
Iso-citrate dehydrogenase
Pyruvate dehydrogenase
Citrate synthase

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

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