ACC Biology Accuplacer Practice Test

What base pairs with adenine in DNA?

Cytosine Guanine Thymine Uracil

Correct Answer:

Thymine

Explanation:

In DNA, adenine pairs with thymine through two hydrogen bonds. This pairing is part of the base pairing rules in which purines (adenine and guanine) pair with pyrimidines (cytosine and thymine). The specificity of this pairing is essential for DNA structure and function, as it ensures accurate replication of genetic information during cell division. Cytosine pairs with guanine, while uracil is found in RNA, where it pairs with adenine instead of thymine. Understanding these pairings is crucial for grasping how genetic information is stored and transmitted in living organisms.

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