Use the figure to identify a 5′ → 3′ sequence of nucleotides in the DNA template strand for an mRNA coding for the polypeptide sequence Phe-Pro-Lys.

Question

Quizplus · Accepted Answer

The sequence on the template strand is read in the 3′ → 5′ direction, which means we need to look for the complementary 5′ → 3′ sequence.

Phe (UUU) → template strand (AAA)
Pro (CCC) → template strand (GGG)
Lys (AAA) → template strand (TTT)

So, the correct sequence on the template strand would be 5′-CTTCGGGAA-3′, which corresponds to the mRNA coding for the polypeptide sequence Phe-Pro-Lys.

Use the Figure to Identify a 5′ → 3′ Sequence