A mutant E.coli strain, grown under conditions that normally induce the lac operon, does not produce $\beta$-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)lacl⁺ lacP⁺ lacO⁺ lacZ⁺ lacY⁺ lacA⁺ D)lacI⁺ lacP^- lacO⁺ lacZ⁺ lacY⁺ lacA⁺ E)lacI^_ lacP⁺ lacO^-lacZ⁺ lacY⁺ lacA^-

Question

Quizplus · Accepted Answer

The lacP- mutation affects the promoter, preventing RNA polymerase from binding and initiating transcription, thus no β-galactosidase is produced.

A Mutant E β\betaβ -Galactosidase

A Mutant E $\beta$ -Galactosidase