In lac operon,the switching on or switching o | vedclass

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(B) In the $lac$ operon,the expression of structural genes is regulated by a repressor protein,which is the product of the regulator gene ($i$ gene).W

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regulator protein

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(B) In the $lac$ operon,the expression of structural genes is regulated by a repressor protein,which is the product of the regulator gene ($i$ gene).When the inducer (lactose) is absent,the repressor protein binds to the operator region,preventing $RNA$ polymerase from transcribing the structural genes (switching off).When the inducer (lactose/allolactose) is present,it binds to the repressor protein,causing a conformational change that prevents the repressor from binding to the operator,thereby allowing transcription to proceed (switching on).Thus,the regulator protein is responsible for switching the operator on or off.

List-$I$	List-$II$
$A$. Gene $a$	$I$. $\beta$-galactosidase
$B$. Gene $y$	$II$. Transacetylase
$C$. Gene $i$	$III$. Permease
$D$. Gene $z$	$IV$. Repressor protein

In $lac$ operon,the switching on or switching off of the operator is achieved by . . . . . . .

Similar Questions

If $E. coli$ is grown in a culture medium containing both glucose and lactose as carbon sources,when will its $lac$ operon be in the 'switch on' state?

In $Escherichia \ coli$,$lac$ operon is induced by

What does '$1$' represent in the given figure?

Match List-$I$ with List-$II$.

List-$I$ List-$II$

$A$. Gene $a$ $I$. $\beta$-galactosidase

$B$. Gene $y$ $II$. Transacetylase

$C$. Gene $i$ $III$. Permease

$D$. Gene $z$ $IV$. Repressor protein

Choose the correct answer from the options given below:

What does an operon represent?

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