Energy and Metabolism

ID #1673

I understand that oxidative phosphorylation is the overall process of ATP synthesis in the presence of Oxygen and that the process is broken down into the ETC and Chemiosmosis. What I am having trouble with is whether or not substrate-level phosphorylation occurs in the presence of oxygen or not. What I am thinking is that it is part of glycolysis which does not depend on oxygen and therefore neither does substrate-level phosphorylation. Is that a correct distinction between oxidative and substrata phosphorylation?

As far as SLP, it is fairly simply defined as the phosphorylation of ADP, synthesizing ATP, using the energy provided by a coupled exergonic reaction. It wouldn't be fair to say it only happens in the presence of oxygen or only happens in the absence of oxygen, because there are SLP reactions in glycolysis (which does not require oxygen) and Krebs cycle (which does).

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