Which DNA template sequence corresponds to the methionine codon in mRNA?

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Multiple Choice

Which DNA template sequence corresponds to the methionine codon in mRNA?

Explanation:
The key idea is that the mRNA codon for methionine is AUG, and the DNA template strand is complementary to the mRNA and read in the opposite direction. To pair with AUG, the template must have T in the first position (A pairs with T), A in the second (U pairs with A), and C in the third (G pairs with C). So the DNA template sequence is TAC, written 3' to 5'. This is why TAC is the correct template sequence. The coding DNA strand would be ATG, which matches AUG in the sense strand but is not the template strand.

The key idea is that the mRNA codon for methionine is AUG, and the DNA template strand is complementary to the mRNA and read in the opposite direction. To pair with AUG, the template must have T in the first position (A pairs with T), A in the second (U pairs with A), and C in the third (G pairs with C). So the DNA template sequence is TAC, written 3' to 5'. This is why TAC is the correct template sequence. The coding DNA strand would be ATG, which matches AUG in the sense strand but is not the template strand.

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