Discussion
Oxidative phosphorylation occurs at
Answer: A
Oxidative phosphorylation occurs at the Inner mitochondrial membrane.
The electron transport chain (complexes I to IV) and ATP synthase are embedded in the inner mitochondrial membrane, folded into cristae. Electron transport pumps protons out across this membrane, and the protons flowing back through ATP synthase drive the formation of ATP.
The mitochondrial matrix is where the Krebs cycle runs. The chloroplast carries out photophosphorylation, on its thylakoid membranes, and its stroma (matrix) is the site of the Calvin cycle, so neither chloroplast option is correct.
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