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Answers. Best Answer: That is precisely what it requires as also denoted by the word oxidative phosphorylation. It happens through the electron transport chain process and the proton gradient it creates. Substrate level phosphorylation does not require oxygen, it occurs during glycolysis and the Krebs cycle.Source(s): greendawn Â· 7 years ago.t happens through the electron transport chain process and the proton gradient it creates. Substrate level phosphorylation does not require oxygen, it occurs during glycolysis and the Krebs cycle. Source(s): greendawn Â· 7 years ago.
Together, the electron transport chain and chemiosmosis make up oxidative phosphorylation. The key steps of this process, shown in simplified form in the diagram above, include: 1  Delivery of electrons by NADH and FADH2_2â2ââstart subscript, 2, end subscript. 2  Electron transfer and proton pumping. 3  Splitting of oxygen to form water. 4  Gradient-driven synthesis of ATP.