TCA Cycle
During cellular respiration, most of the ATP made, is generated by

photophosphorylation
substrate-level phosphorylation
glycolysis
oxidative phosphorylation

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TCA Cycle
Most multi-cellular organisms obtain energy for the synthesis of ATP during oxidative phosphorylation from

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

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