What does the lac operon control in E. coli?

When the lac operon controls the expression of proteins in the E. Coli cell that can break down lactose into two sugars, glucose and galactose When lactose is present, it binds to the repressor that typically sits on the lac operon, changing the repressor's conformation such that it can no longer bind to the lac operon. Because of this, RNA polymerase can now transcribe the gene into mRNA, which in turn is translated into the proteins that can break down lactose.

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