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he lac operon in E. coli regulates the co-expression of three genes needed for the degradation...

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Biology

he lac operon in E. coli regulates the co-expression of threegenes needed for the degradation of lactose (but absence ofglucose) in the growth medium. These genes are not expressed whenthe bacteria has no lactose to feed on. How does the cell preventexpressing the lac operon in the absence of lactose? How does thepresence of lactose activate the transcription of these threegenes? (You do not need to explain the glucose levelregulation.)

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Lactose is a disaccharide made up of Dgalactose and Dglucose The enzyme beta galactosidase breaks down lactose into galactose and glucose and also catalyzing the isomerization of lactose to allolactose a compound important for    See Answer
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