Practice Exams › AP Biology — Cell Respiration › Question #23
High-School-Ap Biology
Substrate-level phosphorylation differs from oxidative phosphorylation in that it:
1
Does not require oxygen or an electron transport chain
✓ Correct Answer

Explanation

Substrate-level phosphorylation transfers a phosphate directly from a phosphorylated intermediate (e.g., 1,3-bisphosphoglycerate) onto ADP, without involving the ETC or O2. Oxidative phosphorylation requires the chemiosmotic gradient.

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