Which nucleotide is replaced by uracil in RNA?

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Study for the A2 Genetic Control of Proteins and Control of Gene Expression Test. Utilize flashcards and multiple-choice questions, each with hints and explanations. Prepare for your exam confidently!

Multiple Choice

Which nucleotide is replaced by uracil in RNA?

Explanation:
Uracil takes the place of thymine in RNA. RNA uses ribose sugar, and the pyrimidine used is uracil instead of thymine, so the bases in RNA are A, U, C, and G. Uracil pairs with adenine just as thymine does with adenine in DNA, but thymine is the methylated form of uracil that DNA uses, contributing to DNA’s stability and distinguishing it from RNA. So the nucleotide that is replaced by uracil in RNA is thymine.

Uracil takes the place of thymine in RNA. RNA uses ribose sugar, and the pyrimidine used is uracil instead of thymine, so the bases in RNA are A, U, C, and G. Uracil pairs with adenine just as thymine does with adenine in DNA, but thymine is the methylated form of uracil that DNA uses, contributing to DNA’s stability and distinguishing it from RNA. So the nucleotide that is replaced by uracil in RNA is thymine.

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