Answer:
Substrate level phosphorylation
Explanation:
Citric acid cycle forms two ATP molecules per glucose by Substrate level phosphorylation. Succinyl-CoA is one of the intermediates of the citric acid cycle and has a thioester bond with a strongly negative standard free energy of hydrolysis. The energy released in the breakage of this bond during the conversion of succinyl CoA into succinate is used to drive the synthesis of a phosphoanhydride bond in either GTP. This process of ATP formation that is not coupled to the electron-transfer chain is called substrate-level phosphorylation. The GTP formed by succinyl-CoA synthetase gives its terminal phosphoryl group to ADP and form ATP.
