MDCAT Biology MCQ #230

A biochemist tracks the production of reduced coenzymes in the Krebs cycle. At which specific step is the flavin adenine dinucleotide (FAD) reduced?

MDCAT Biology MCQ #230

  1. Question 1

    Q1. A biochemist tracks the production of reduced coenzymes in the Krebs cycle. At which specific step is the flavin adenine dinucleotide (FAD) reduced?

    • A) Isocitrate to alpha-ketoglutarate
    • B) Malate to oxaloacetate
    • C) Pyruvate to Acetyl-CoA
    • D) Succinate to fumarate

    Answer: Succinate to fumarate

    Explanation: FADH2 is produced specifically during the oxidation of succinate to fumarate. Option A is wrong because isocitrate oxidation produces NADH.