Question 1
Which of the following mutants are noninducible?
◦
lacIS◦
lacI -◦
lacI+◦
lacOC◦
lacO+Question 2
Which of the following mutations of the
trpL region would be least likely to affect attenuation of
trp operon transcription?
◦ a deletion of region 4
◦ a deletion of the uracil nucleotides immediately following region 4
◦ a deletion of the start (AUG) codon of the
trpL polypeptide
◦ an insertion of two nucleotides immediately after the polypeptide stop codon
◦ an insertion of two nucleotides immediately following the polypeptide start codon