A mutant E. coli strain, grown under conditions that normally induce the lac operon, produces particularly high amounts of ß-galactosidase. What is a possible genotype of the cells? A) lacI⁺ lacP⁺ lacO⁺ lacZ^- lacY⁺ lacA⁺ B) lacI⁺ lacP⁺ lacO^c lacZ⁺ lacY⁺ lacA⁺ C) lacI^- lacP⁺ lacO⁺ lacZ^- lacY⁺ lacA⁺ D) lacI⁺ lacP^- lacO⁺ lacZ⁺ lacY⁺ lacA⁺ E) lacI^- lacP^- lacO⁺ lacZ^- lacY⁺ lacA^-

Question

Quizplus · Accepted Answer

The lacO^c mutation (constitutive operator) allows continuous expression of the lac operon, leading to high levels of ß-galactosidase production regardless of the presence of an inducer.

A Mutant E