In the lac-operon model,lactose molecules fun | vedclass

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(D) In the $lac$-operon model,lactose acts as an inducer.Normally,the repressor protein produced by the $i$-gene binds to the operator region,preventi

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Inducers which bind with the repressor protein

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(D) In the $lac$-operon model,lactose acts as an inducer.Normally,the repressor protein produced by the $i$-gene binds to the operator region,preventing $RNA$ polymerase from transcribing the structural genes.When lactose is present,it binds to the repressor protein,causing a conformational change that prevents the repressor from binding to the operator.This allows $RNA$ polymerase to transcribe the structural genes,thus regulating gene expression.

Column-$I$	Column-$II$
$(i)$ Operator site	$(a)$ Codes for enzyme (protein)
$(ii)$ Promoter site	$(b)$ Codes for repressor
$(iii)$ Structural gene	$(c)$ Binding site for $RNA$ polymerase
$(iv)$ Regulator gene	$(d)$ Binding site for repressor

In the $lac$-operon model,lactose molecules function as:

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The differentiation of organs and tissues in a developing organism is associated with which of the following?

Identify the $INCORRECT$ statement with reference to the regulation of gene expression.

Describe the regulation of gene expression in prokaryotes with an example.

Match Column-$I$ with Column-$II$:

Column-$I$ Column-$II$

$(i)$ Operator site $(a)$ Codes for enzyme (protein)

$(ii)$ Promoter site $(b)$ Codes for repressor

$(iii)$ Structural gene $(c)$ Binding site for $RNA$ polymerase

$(iv)$ Regulator gene $(d)$ Binding site for repressor

$A$: $Lac$ operon exerts negative control only.
$R$: The operator is occupied by aporepressor during regulation.

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