Question

In aerobic cellular respiration, which generates more ATP, substrate-level phosphorylation or chemiosmosis?

• A. Substrate-level phosphorylation
• B. Chemiosmosis
• C. Both generate the same amount of ATP
• D. Neither generates any ATP

Answer 1

The correct option is B

Chemiosmosis

In aerobic cellular respiration, ATP production through chemiosmotic synthesis is linked to the proton gradient generated by the Electron transport system. 30-32 molecules of ATP are generated by chemiosmosis during breakdown of one molecule of glucose. Whereas only about 8 molecules are formed through substrate level phosphorylation, that is transfer of a high energy phosphate group from a substrate to ADP.