If a Mutation Deactivated a Regulatory Gene of a Repressible

question 4

Multiple Choice

If a mutation deactivated a regulatory gene of a repressible operon in an E. coli cell which of the following describes the most likely outcome?

• 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