Question

a mutation that inactivates the regulatory gene of a repressible operon in an e. coli cell would results in which of the following outcomes? question 5 options: inactivation of rna polymerase by alteration of its active site continuous transcription of the gene controlled by that regulator complete inhibition of transcription of the gene controlled by that regulator continuous translation of the mrna because of alteration of its structure irreversible binding of the repressor to the operator

Answer 1

A mutation inactivating the regulatory gene of a repressible operon like the trp operon in E. coli results in continuous transcription of the genes controlled by that regulator because the repressor protein cannot inhibit transcription.

Step-by-step explanation:

A mutation that inactivates the regulatory gene of a repressible operon, like the trp operon in an E. coli cell, would lead to the continuous transcription of the gene(s) controlled by that regulator. This happens because the repressor protein that is normally produced by the regulatory gene is inactive, thus cannot bind to the operator to inhibit transcription. As a result, RNA polymerase can continuously bind to the promoter and initiate transcription, leading to uninterrupted production of mRNA and subsequent protein synthesis.