Which base is used in RNA instead of thymine?

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Study for the DNA Replication and DNA Storage Test. Use flashcards and multiple choice questions, each with hints and explanations. Prepare for your exam with confidence!

Multiple Choice

Which base is used in RNA instead of thymine?

Explanation:
RNA uses uracil in place of thymine. Uracil pairs with adenine in RNA, just as thymine does with adenine in DNA, but without the methyl group that thymine has. This substitution fits RNA’s structure and chemistry—ribose sugar, usually single-stranded or folded—while still allowing proper base pairing. So the base used in RNA instead of thymine is uracil. The other bases—adenine, cytosine, and guanine—are present in RNA as well, with cytosine pairing with guanine.

RNA uses uracil in place of thymine. Uracil pairs with adenine in RNA, just as thymine does with adenine in DNA, but without the methyl group that thymine has. This substitution fits RNA’s structure and chemistry—ribose sugar, usually single-stranded or folded—while still allowing proper base pairing. So the base used in RNA instead of thymine is uracil. The other bases—adenine, cytosine, and guanine—are present in RNA as well, with cytosine pairing with guanine.

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