Which nucleotide is used in RNA in place of thymine?

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Prepare for the Molecular Basis of Inheritance Test. Enhance understanding with multiple choice questions and detailed explanations. Get exam-ready now!

Multiple Choice

Which nucleotide is used in RNA in place of thymine?

Explanation:
RNA uses uracil instead of thymine. In transcription, the RNA polymerase pairs adenine with uracil, just as DNA pairs adenine with thymine. Uracil is structurally similar to thymine but lacks the methyl group, which fits the simpler, more transient nature of RNA. So the nucleotide taking thymine’s place in RNA is uracil.

RNA uses uracil instead of thymine. In transcription, the RNA polymerase pairs adenine with uracil, just as DNA pairs adenine with thymine. Uracil is structurally similar to thymine but lacks the methyl group, which fits the simpler, more transient nature of RNA. So the nucleotide taking thymine’s place in RNA is uracil.

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