MDCAT Biology MCQ #1000

A molecule of Guanine is distinguished from Cytosine in a diagram by the presence of how many nitrogen-containing rings?

MDCAT Biology MCQ #1000

  1. Question 1

    Q1. A molecule of Guanine is distinguished from Cytosine in a diagram by the presence of how many nitrogen-containing rings?

    • A) One
    • B) Two
    • C) Three
    • D) Four

    Answer: Two

    Explanation: Guanine is a purine with two rings; Cytosine is tempting because it is a pyrimidine with only one nitrogen ring.