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Question
An operon unit consist of
An operon unit consist of
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Solution
The correct option is D Regulator, structural, operator and promoter gene
Lac operon has one promoter, one operator, and one regulatory gene. It has 3 structural genes (z, y and a) which are involved in the metabolism of lactose. These genes transcribe polycistronic mRNA and form 3 enzymes- beta-galactosidase, lactose permease and transacetylase. The operator gene controls the working of structural genes. The cistrons are expressed only when the operator gene is turned on by an inducer which is lactose. The promoter gene is the point of attachment for RNA polymerase. The regulator gene in the absence of lactose codes for a protein called repressor which combines with the operator to suppress the activity of operator gene. Thus the correct answer is option C.
Lac operon has one promoter, one operator, and one regulatory gene. It has 3 structural genes (z, y and a) which are involved in the metabolism of lactose. These genes transcribe polycistronic mRNA and form 3 enzymes- beta-galactosidase, lactose permease and transacetylase. The operator gene controls the working of structural genes. The cistrons are expressed only when the operator gene is turned on by an inducer which is lactose. The promoter gene is the point of attachment for RNA polymerase. The regulator gene in the absence of lactose codes for a protein called repressor which combines with the operator to suppress the activity of operator gene.
Thus the correct answer is option C.
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