MDCAT Biology MCQ #447

In the process of cellular respiration, ATP is generated by two different mechanisms. What distinguishes substrate-level phosphorylation from oxidative phosphorylation?

MDCAT Biology MCQ #447

  1. Question 1

    Q1. In the process of cellular respiration, ATP is generated by two different mechanisms. What distinguishes substrate-level phosphorylation from oxidative phosphorylation?

    • A) The direct transfer of a phosphate group from a substrate to ADP
    • B) The use of ATP synthase to catalyze the formation of ATP
    • C) The requirement of a terminal electron acceptor like oxygen
    • D) The generation of a transmembrane electrochemical gradient

    Answer: The direct transfer of a phosphate group from a substrate to ADP

    Explanation: Substrate-level phosphorylation involves direct phosphate transfer from a substrate, while oxidative phosphorylation uses energy from a proton gradient.