MDCAT Biology MCQ #664

In a DNA double helix, a specific base pair consists of a triple-ringed purine and a single-ringed pyrimidine involving Guanine. How many bonds connect them?

MDCAT Biology MCQ #664

  1. Question 1

    Q1. In a DNA double helix, a specific base pair consists of a triple-ringed purine and a single-ringed pyrimidine involving Guanine. How many bonds connect them?

    • A) Two hydrogen bonds
    • B) Three hydrogen bonds
    • C) One hydrogen bond
    • D) Four hydrogen bonds

    Answer: Three hydrogen bonds

    Explanation: Guanine and Cytosine are linked by three hydrogen bonds. Adenine and Thymine are linked by two.