Which of the following acts as an inducer for | vedclass

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(A) In the $lac$ operon of $Escherichia$ $coli$,the $i$ gene codes for a repressor protein that binds to the operator region and prevents transcriptio

Vedclass · Accepted Answer

Lactose

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(A) In the $lac$ operon of $Escherichia$ $coli$,the $i$ gene codes for a repressor protein that binds to the operator region and prevents transcription.When lactose is present in the medium,it enters the cell and is converted into its isomer,allolactose.Allolactose acts as an inducer by binding to the repressor protein,which changes the shape of the repressor so that it can no longer bind to the operator.This allows $RNA$ polymerase to transcribe the structural genes,thus lactose (or its isomer allolactose) acts as the inducer for the $lac$ operon.

Which of the following acts as an inducer for the $lac$ operon in $Escherichia$ $coli$?

Similar Questions

What effect would you expect if gene expression of the $lac$ operon were completely repressed?

Given below is the representation of the $lac$ operon of $E. coli$. Identify $I$ and $II$ from the options given below.

$I$ Promoter $II$ $Z$ $Y$ $A$

When glucose is the normal energy source in a bacterial cell,which gene transcribes a repressor mRNA?

Statement-$I$: Lac operator is present only in lac operon and it interacts specifically with lac-repressor only.
Statement-$II$: Each operon has its specific operator and specific repressor.

Lac operon is:

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