A Mutant E $\beta$ -Galactosidase in the Absence of Glucose Whether or Not Lactose

question 48

Multiple Choice

A mutant E. coli strain is found that synthesizes $\beta$ -galactosidase in the absence of glucose whether or not lactose is present. What two mutations might lead to this outcome?

• A) lacI^s mutation or lacO^c mutation
• B) lacP^- mutation or lacI^- mutation
• C) lacP^- mutation or lacO^c mutation
• D) lacI^- mutation or lacO^c mutation
• E) lacP^- mutation or lacI^s mutation

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