The formation of ATP by direct transfer of a phosphate group from a substrate molecule to ADP is called
Correct answer: B. substrate level phosphorylation
- 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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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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