Question

A mutation in the gene encoding the lactose repressor (lacI) that prevents lactose from binding to the LacI protein would result in a. constant expression of the lac operon in the presence of lactose. b. constant repression of the lac operon in the presence of lactose. c. constant expression of the lac operon in the absence of lactose. d. constant repression of the lac operon in the absence of lactose.

Answer 1

Answer:

c. constant expression of the lac operon in the absence of lactose.

Explanation:

The lac operon allows to shift the metabolism from glucose to lactose. In the abscence of lactose, this repressor, lacl, impede the expression of the lac operon. If this repressor is not functional, the lac operon would be expressed in the absence of lactose.