The codon sequence on coding strand of transcription unit is ATG GTG AGC TAC GCG. What will be the codon sequence on mRNA formed on template strand?

ATG GTG AGC TAC GCG

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GCG TAC AGC GTG ATG

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TAC CAC TGC ATG CGC

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AUG GUG AGC UAC GCG

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Solution

The correct option is C AUG GUG AGC UAC GCG
Nitrogenous bases follow complimentary base pairing. Adenine is complimentary to thymine and guanine is complimentary to cytosine. Thymine is replaced with uracil in RNA. Accordingly, the complimentary base pairing for the given sequence of ATG GTG AGC TAC GCG on coding strand will be TAC CAC TCG ATG CGC on template strand. From this template strand, the codon sequence on mRNA will be AUG GUG AGC UAC GCG.
Thus, the correct answer is option D.

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