In bacteria,a particular gene codes for a protein that helps the bacteria break down and use lactose as a food source.If no lactose is present,

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The promoter for the gene that codes for the lactose-utilizing enzyme will be blocked if there is no lactose present. This is because the presence of lactose activates a repressor protein that normally inhibits the binding of RNA polymerase to the promoter. Without lactose, the repressor protein remains active and blocks the promoter, preventing the production of the lactose-utilizing enzyme.

In Bacteria,a Particular Gene Codes for a Protein That Helps