Operator constitutive mutants of the lac operon would
A)express the lac repressor constitutively.
B)block the binding of RNA polymerase to the promoter.
C)express β-galactosidase constitutively.
D)prevent the inducer from binding to the repressor.

Question

Quizplus · Accepted Answer

Operator constitutive mutants in the lac operon have a mutation in the operator sequence that prevents the repressor from binding effectively. This means that transcription of the operon is not properly regulated by the presence or absence of lactose, leading to the constitutive (constant) expression of operon genes, including the gene for β-galactosidase.

Operator Constitutive Mutants of the Lac Operon Would