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(D) is the correct answer.In the $Lac$ $Operon$,the $i$ gene is a constitutive gene.Constitutive genes are expressed continuously at a constant rate i

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a constitutive gene

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(D) is the correct answer.In the $Lac$ $Operon$,the $i$ gene is a constitutive gene.Constitutive genes are expressed continuously at a constant rate in a cell,regardless of the environmental conditions or the presence of substrates like $Lactose$.The $i$ gene produces the repressor protein,which regulates the expression of the structural genes $(z, y, a)$ by binding to the operator region.Since it is constitutive,it does not require an inducer to be transcribed,ensuring that the repressor protein is always available to keep the operon switched off in the absence of $Lactose$.

When $Escherichia$ $coli$ cells are cultured in a medium where $Lactose$ is absent,the $i$ gene of $Lac$ $Operon$ continues to produce repressor $mRNA$,because it is:

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