Which base is found in RNA but not in DNA?

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Multiple Choice

Which base is found in RNA but not in DNA?

Explanation:
Uracil is the base found in RNA but not in DNA. RNA uses adenine, cytosine, guanine, and uracil, while DNA uses adenine, cytosine, guanine, and thymine. Uracil pairs with adenine in RNA, whereas thymine pairs with adenine in DNA. The extra methyl group on thymine helps stabilize DNA and aids repair systems in distinguishing cytosine’s deamination products. So uracil’s presence in RNA—and absence in DNA—is the key distinction.

Uracil is the base found in RNA but not in DNA. RNA uses adenine, cytosine, guanine, and uracil, while DNA uses adenine, cytosine, guanine, and thymine. Uracil pairs with adenine in RNA, whereas thymine pairs with adenine in DNA. The extra methyl group on thymine helps stabilize DNA and aids repair systems in distinguishing cytosine’s deamination products. So uracil’s presence in RNA—and absence in DNA—is the key distinction.

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