Which of the following processes would result from a mutation that deactivates a regulatory gene of a repressible operon in an E. coli cell?
A) continuous transcription of the structural gene controlled by that regulator
B) complete inhibition of transcription of the structural gene controlled by that regulator
C) irreversible binding of the repressor to the operator
D) continuous translation of the mRNA because of alteration of its structure

Question

Quizplus · Accepted Answer

A repressible operon is usually turned on unless a specific regulatory protein (repressor) binds to the operator to prevent transcription. If the regulatory gene is deactivated, the repressor protein cannot be produced, and it would not bind to the operator, leading to continuous transcription.

Which of the Following Processes Would Result from a Mutation