MDCAT Biology MCQ #368

Which 2-carbon molecule enters the Krebs cycle by combining with a 4-carbon oxaloacetate molecule to form citric acid?

MDCAT Biology MCQ #368

  1. Question 1

    Q1. Which 2-carbon molecule enters the Krebs cycle by combining with a 4-carbon oxaloacetate molecule to form citric acid?

    • A) Pyruvate
    • B) Acetyl-CoA
    • C) Succinate
    • D) Malate

    Answer: Acetyl-CoA

    Explanation: Acetyl-CoA (2C) joins with Oxaloacetate (4C) to form Citrate (6C). Pyruvate (Option A) must be converted to Acetyl-CoA first.