According to the lac operon concept, which functional unit of the bacterial genetic material is responsible for suppressing the activity of the operator gene in the absence of lactose?
A
Regulator gene
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B
Structural gene
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C
Promoter gene
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D
Repressor protein
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Solution
The correct option is D Repressor protein In the absence of lactose, the repressor protein is responsible for suppressing the activity of the operator gene.