Using the figure identify a 5'→ 3' sequence of nucleotides in the DNA template strand for an mRNA coding for the polypeptide sequence Phe-Pro-Lys.
A) 5'-UUUCCCAAA-3'
B) 5'-GAACCCCTT-3'
C) 5'-CTTCGGGAA-3'
D) 5'-AAACCCUUU-3'

Question

Quizplus · Accepted Answer

The mRNA sequence for Phe-Pro-Lys is 5'-UUUCCCAAA-3'. The DNA template strand is complementary and antiparallel to the mRNA, so the correct DNA template sequence is 5'-AAAGGGTTT-3'. However, this exact sequence isn't an option. The correct answer, therefore, must be the complement and reverse of the mRNA sequence, which is 5'-TTTGGGAA-3' in the 5' to 3' direction, matching closest with option C) 5'-CTTCGGGAA-3', considering transcription errors in the provided options.

Using the Figure Identify a 5'→ 3' Sequence of Nucleotides