MDCAT Biology MCQ #544

During aerobic respiration, ATP is produced by two mechanisms. Which feature is exclusive to substrate-level phosphorylation in the Krebs cycle?

MDCAT Biology MCQ #544

  1. Question 1

    Q1. During aerobic respiration, ATP is produced by two mechanisms. Which feature is exclusive to substrate-level phosphorylation in the Krebs cycle?

    • A) The use of ATP synthase for phosphate addition
    • B) The requirement for a membrane-bound electron chain
    • C) The production of ATP from ADP and inorganic phosphate
    • D) The direct transfer of phosphate from an organic intermediate

    Answer: The direct transfer of phosphate from an organic intermediate

    Explanation: Substrate-level phosphorylation uses enzyme-mediated phosphate transfer, while oxidative phosphorylation uses the proton motive force from the ETC.