The formation of ATP by direct transfer of a phosphate group from a substrate molecule to ADP is called
- A. oxidative phosphorylation
- B. substrate level phosphorylation
- C. photophosphorylation
- D. chemiosmosis
Explanation
This is how ATP is made twice in glycolysis and once per turn of the Krebs cycle, and it needs no membrane, no oxygen and no proton gradient. Oxidative phosphorylation is the indirect route through the electron transport chain and ATP synthase, and chemiosmosis is the mechanism behind it. Photophosphorylation is the equivalent light driven process in chloroplasts.
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