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

both of these compounds generate chemical energy during catabolism
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

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