A: Lac operon exerts negative control only.R: | vedclass

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(D) The $Lac$ operon exhibits both negative and positive control.In negative control,the repressor protein binds to the operator to inhibit transcript

Vedclass · Accepted Answer

Both Assertion and Reason are incorrect.

Vedclass · Answer

(D) The $Lac$ operon exhibits both negative and positive control.In negative control,the repressor protein binds to the operator to inhibit transcription.In positive control,the $CAP$ (Catabolite Activator Protein) binds to the promoter to enhance transcription.Therefore,Assertion $A$ is incorrect because it states that the $Lac$ operon exerts only negative control.Reason $R$ is also incorrect because the operator is occupied by the active repressor protein,not the aporepressor (which is an inactive form of the repressor).

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

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