Jacob, Monod, and Pardee used various E.coli mutants to help determine how the lac operon is regulated. The descriptions of some of the mutants are listed. For each E. coli mutant determine if the lac operon would be on or off in a lactose-only environment.
a. laci mutant: This mutant produces a super repressor that is not inactivated by allolactose.
b. lacO mutant: This mutant has an altered operator sequence so that the repressor protein is no longer able to bind the operator sequence.
c. lacP mutant: This mutant has an altered promoter sequence so that RNA polymerase cannot bind.