In the lac operon of E. coli, if the lacI region was moved to a different section of the chromosome, but was otherwise unchanged, the most likely result would be that
A) the repressor protein would not be synthesised, so expression of the lac operon would become constitutive.
B) the repressor protein would always be synthesised, so expression of the lac operon would always be repressed.
C) the repressor protein would exert its normal effect on the expression of the lac operon because the lacI gene can act in trans.
D) expression of the lac operon would depend on different repressors, depending on where the lacI was integrated into the chromosome.
E) expression of the lac operon would remain normal because the lacI gene is not involved in the regulation of the lac operon.

Question

Quizplus · Accepted Answer

The lacI gene encodes the lac repressor, which can function regardless of its position on the chromosome because it acts in trans, meaning it can regulate the lac operon by diffusing through the cytoplasm and binding to the operator sequence of the operon.

In the Lac Operon of E