MDCAT Biology MCQ #781

Human hemoglobin is a complex protein that transports oxygen. How many polypeptide chains comprise its quaternary structure?

MDCAT Biology MCQ #781

  1. Question 1

    Q1. Human hemoglobin is a complex protein that transports oxygen. How many polypeptide chains comprise its quaternary structure?

    • A) One alpha and one beta chain
    • B) Four alpha chains
    • C) Two alpha and two beta chains
    • D) Three beta and one alpha chain

    Answer: Two alpha and two beta chains

    Explanation: Hemoglobin is a quaternary protein consisting of four polypeptide chains: two alpha and two beta chains, unlike myoglobin.