The Krebs cycle and glycolysis both involve substrate level phosphorylation. Inside the electron transport chain, oxidative phosphorylation takes place.
Electrons from NADH and FADH2 mix with O2 during oxidative phosphorylation, and the energy generated from these oxidation/reduction events is utilized to power the production of ATP from ADP. Known also as electron transport-linked phosphorylation, oxidative phosphorylation
The Kreb's cycle produces 24-28 ATP molecules from one sugar molecule that has already been converted into pyruvate. Two theoretical approaches are utilized to investigate oxidative phosphorylation: metabolic lead to the current and irregular thermodynamics.
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