Genetics and Molecular Biology Practice Exam 2026 – Comprehensive Study Resource

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Which base is present in RNA but not in DNA?

Adenine

Uracil

Uracil is the base found in RNA but not in DNA. In RNA, uracil pairs with adenine, taking the place of thymine, which is the base used in DNA to pair with adenine. The other bases—adenine, cytosine, and guanine—are present in both RNA and DNA. Using thymine in DNA helps protect the genetic material from certain types of mutations that can arise if uracil were present.

Cytosine

Guanine

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