A Mutant E $\beta$ -Galactosidase

question 30

Multiple Choice

A mutant E.coli strain, grown under conditions that normally induce the lac operon, produces high amounts of $\beta$ -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)lacI^- lacP⁺ lacO⁺ lacZ^- lacY⁺ lacA⁺
• D)lacI⁺ lacP^- lacO⁺ lacZ⁺ lacY⁺ lacA⁺
• E)lacI^- lacP^- lacO⁺ lacZ^- lacY⁺ lacA^-

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