The amino acid constituent of a protein is given: Methionine, Valine, Tyrosine, Arginine, Threonine, Stop codon. Choose the correct DNA sequence from below which codes for it.

AUGCAAATGTGTATGUAG

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TACATGTCTAGGUGAAUG

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TACCAAATGTCTTGCATC

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TCAGCCTGTTCTGCGATC

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Solution

The correct option is C TACCAAATGTCTTGCATC
According to option C, the codons coding for the given amino acids are AUG (Met), GUU (Val), UAC (Tyr), AGA (Arg), ACG (Thr), UAG (stop codon). Thus, the mRNA sequence would be AUGGUUUACAGAACGUAG. The question asks for the DNA sequence from which such an mRNA strand gets copied. Thus, the template strand of DNA would be complementary to this mRNA (with T replacing U), reading TACCAAATGTCTTGCATC.

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