MDCAT Biology MCQ #215

ATP is generated via two main mechanisms in the mitochondria. What defines substrate-level phosphorylation during the Krebs cycle?

MDCAT Biology MCQ #215

  1. Question 1

    Q1. ATP is generated via two main mechanisms in the mitochondria. What defines substrate-level phosphorylation during the Krebs cycle?

    • A) Direct transfer of phosphate from a substrate
    • B) Use of ATP synthase and a proton gradient
    • C) Requirement of molecular oxygen
    • D) Occurrence in the mitochondrial cristae

    Answer: Direct transfer of phosphate from a substrate

    Explanation: Oxidative phosphorylation uses an electron transport chain and chemiosmosis, while substrate-level phosphorylation transfers a phosphate directly from a substrate to ADP.