Which of the following mutations of the trpL region would be least likely to affect attenuation of trp operon transcription?
A) an insertion of two nucleotides immediately after the polypeptide stop codon
B) an insertion of two nucleotides immediately following the polypeptide start codon
C) a deletion of the uracil nucleotides immediately following region 4
D) a deletion of region 4
E) a deletion of the start (AUG) codon of the trpL polypeptide

Question

Quizplus · Accepted Answer

An insertion of two nucleotides immediately after the polypeptide stop codon would be least likely to affect attenuation because it occurs after the region critical for attenuation mechanism, which involves the formation of stem-loop structures in the mRNA that are upstream of the stop codon.

Which of the Following Mutations of the TrpL Region Would