When considering how nitrogenous bases pair to form a double helix, which of the following pairs occur most often?
A) Cytosine-Guanine
B) Thymine-Cytosine
C) Adenine-Cytosine
D) Guanine-Thymine

Question

Quizplus · Accepted Answer

Cytosine and Guanine have three hydrogen bonds between them, making them a stronger bond than Adenine-Thymine, which only have two hydrogen bonds. Therefore, Cytosine-Guanine pairs occur more often in a double helix than Thymine-Cytosine or Adenine-Cytosine pairs.

When Considering How Nitrogenous Bases Pair to Form a Double