MDCAT Biology MCQ #974

The double helix of DNA is held together by base pairing. What is the specific mechanism for the interaction between Guanine and Cytosine?

MDCAT Biology MCQ #974

  1. Question 1

    Q1. The double helix of DNA is held together by base pairing. What is the specific mechanism for the interaction between Guanine and Cytosine?

    • A) Covalent bonding between purines and pyrimidines
    • B) Three hydrogen bonds between Adenine and Thymine
    • C) Three hydrogen bonds between Guanine and Cytosine
    • D) Hydrophobic interactions between the pentose sugars

    Answer: Three hydrogen bonds between Guanine and Cytosine

    Explanation: Guanine and cytosine form three hydrogen bonds, while adenine and thymine form two, providing specific structural stability.