Which base is unique to DNA and not typically found in RNA?

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Multiple Choice

Which base is unique to DNA and not typically found in RNA?

Explanation:
DNA and RNA differ in their base composition. The base unique to DNA is thymine; RNA uses uracil in place of thymine. Thymine has a methyl group at the 5 position, which uracil lacks, and this small difference helps DNA maintain long-term stability and also allows cellular repair systems to distinguish true thymine from uracil accidentally appearing in DNA. Adenine and cytosine are present in both DNA and RNA, while uracil is found in RNA. That makes thymine the base specific to DNA.

DNA and RNA differ in their base composition. The base unique to DNA is thymine; RNA uses uracil in place of thymine. Thymine has a methyl group at the 5 position, which uracil lacks, and this small difference helps DNA maintain long-term stability and also allows cellular repair systems to distinguish true thymine from uracil accidentally appearing in DNA. Adenine and cytosine are present in both DNA and RNA, while uracil is found in RNA. That makes thymine the base specific to DNA.

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