Kaplan Nursing Entrance Practice Exam

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Which of the following nucleotides is not found in DNA?

Guanine
Cytosine
Uracil
Adenine

The correct answer is: Uracil

The correct answer is that uracil is not found in DNA. In DNA, the nucleotides consist of adenine, thymine, cytosine, and guanine. Uracil is a nucleotide that is found in RNA instead of thymine. The base pairing in RNA includes adenine pairing with uracil, whereas in DNA, adenine pairs with thymine. This distinction between RNA and DNA nucleotides is fundamental to understanding their different roles in genetic information storage and transmission.