Which of the following is true for a repressi | vedclass

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(B) repressible operon is typically involved in anabolic pathways (e.g.,$trp$ operon). In its default state,the operon is $ON$ (transcription occurs).

Vedclass · Accepted Answer

Inactive repressor + Co-repressor = Active repressor

Vedclass · Answer

(B) repressible operon is typically involved in anabolic pathways (e.g.,$trp$ operon). In its default state,the operon is $ON$ (transcription occurs). When the end product (co-repressor) accumulates,it binds to the inactive repressor protein. This binding activates the repressor,which then binds to the operator to turn the operon $OFF$. Therefore,the correct mechanism is: Inactive repressor + Co-repressor = Active repressor.

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

Which of the following is true for a repressible operon?

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The 'Operon model' for gene regulation in bacteria was proposed by:

Who proposed the operon model for the first time?

In the $lac$ operon,if a nonsense mutation occurs in the $lac\, y$ gene,which enzymes will be synthesized?

The activity of the structural gene is controlled by:

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:

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