MDCAT Biology MCQ #738

In the Watson-Crick model of DNA, the two strands are held together by base pairing. What is the mechanism of pairing between Adenine and Thymine?

MDCAT Biology MCQ #738

  1. Question 1

    Q1. In the Watson-Crick model of DNA, the two strands are held together by base pairing. What is the mechanism of pairing between Adenine and Thymine?

    • A) Three hydrogen bonds between A and T
    • B) Two hydrogen bonds between G and C
    • C) Two hydrogen bonds between A and T
    • D) Covalent sharing of electrons between bases

    Answer: Two hydrogen bonds between A and T

    Explanation: Adenine and Thymine form two hydrogen bonds, while Guanine and Cytosine form three. Covalent bonds do not link the two strands.