Which base is found in DNA but not RNA?

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Which base is found in DNA but not RNA?

Explanation:
The key idea is the difference in bases between DNA and RNA. DNA contains thymine among its bases, whereas RNA uses uracil instead of thymine. So thymine is found in DNA but not in RNA. The other bases—adenine, cytosine, and guanine—are present in both molecules. Thymine’s methyl group helps distinguish true thymine from potentially deaminated cytosine (which would appear as uracil) and supports DNA repair recognition, contributing to DNA stability.

The key idea is the difference in bases between DNA and RNA. DNA contains thymine among its bases, whereas RNA uses uracil instead of thymine. So thymine is found in DNA but not in RNA. The other bases—adenine, cytosine, and guanine—are present in both molecules. Thymine’s methyl group helps distinguish true thymine from potentially deaminated cytosine (which would appear as uracil) and supports DNA repair recognition, contributing to DNA stability.

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