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 cell membrane
a proton gradient across the inner mitochondrial membrane

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TCA Cycle
The catabolism of sugars and fatty acids is similar because

All of these
both of these compounds generate redox energy during catabolism
both of these compounds are funnelled through the TC A/citric acid cycle
both of these compounds generate chemical energy during catabolism

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