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	Mechanism for the regulation of the expression of lac operon in E coli
	An operon can be defined as a group of genes located together in a genome which are expressed as a single unit. Lac operon contains three genes involved in producing proteins that convert the disaccharide lactose into glucose and galactose, its monosaccharide components. This process allows E.coli to utilise lactose as an energy source when glucose is unavailable. Lac operon is not often expressed, as glucose is usually present as an energy source. However, in the absence of glucose and when lactose is present, the operon is switched on and the three genes are expressed. Approximate Word count = 428 Approximate Pages = 1.7 (250 words per page double spaced)

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