Cellular Respiration

AP Biology· difficulty 3/5

Substrate-P (high energy) enzyme Product ATP ADP

Which pair of stages of cellular respiration use this mechanism?

  • A

    Calvin cycle and ETC

  • B

    ETC and chemiosmosis

  • C

    Pyruvate oxidation and ETC

  • D

    Glycolysis and the Krebs cycle

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Explanation

Substrate-level phosphorylation (direct enzymatic transfer of P from substrate to ADP) occurs in glycolysis and Krebs. Oxidative phosphorylation drives the rest.

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