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During transcription, from the DNA template complementary mRNA is formed and thymine is replaced by uracil.

1. Thymine is replaced by uracil in mRNA.
2. Thymine is replaced by cytosine in mRNA.
3. Thymine is replaced by adenine in mRNA.
4. Thymine is replaced by guanine in mRNA.

Correct answer: Thymine is replaced by uracil in mRNA.

Solution

In RNA, thymine is not used; uracil takes its place. So when mRNA is synthesized from a DNA template, the RNA sequence uses uracil wherever DNA would have thymine.

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