Humber Admissions Practice Test

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Which nitrogen base pairs with Guanine in DNA?

Adenine
Cytosine
Uracil
Thymine

The correct answer is: Cytosine

In DNA, Guanine pairs specifically with Cytosine through hydrogen bonds. This pairing is part of the base pairing rules established by Watson and Crick, which are foundational to understanding the structure of DNA. The complementary nature of these bases ensures that the genetic information is accurately replicated during cell division. Guanine, being a purine, pairs with Cytosine, which is a pyrimidine, creating a stable structure that supports the double helix formation of DNA. The specific pairing is crucial for maintaining the integrity of the genetic code.