TCA Cycle
The end product of glycolysis is pyruvate, which enters the citric acid cycle after being converted to

acetaldehyde
none of these
acetyl-CoA
acetic acid

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

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