In RNA, what base replaces thymine?

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Multiple Choice

In RNA, what base replaces thymine?

Explanation:
RNA uses uracil instead of thymine, so adenine pairs with uracil in RNA. Uracil is a pyrimidine like thymine but without the methyl group, which keeps RNA synthesis streamlined and suits its typically short-lived, single-stranded role. In contrast, DNA uses thymine (with the extra methyl) to help stabilize the molecule and aid in recognizing cytosine deamination as damage. So the base that replaces thymine in RNA is uracil.

RNA uses uracil instead of thymine, so adenine pairs with uracil in RNA. Uracil is a pyrimidine like thymine but without the methyl group, which keeps RNA synthesis streamlined and suits its typically short-lived, single-stranded role. In contrast, DNA uses thymine (with the extra methyl) to help stabilize the molecule and aid in recognizing cytosine deamination as damage. So the base that replaces thymine in RNA is uracil.

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