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Emily Summers




In the absence of Lactose:

The regulator gene is expressed so the repressor protein is synthesised

The repressor protein has two binding sites, one to lactose and one to the operator region


The repressor protein binds to the operator region, covering part of the promoter region where RNA…

Page 2

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Emily Summers




Now E coli bacteria is able to use lactose permease to take up lactose from the medium into their
cells

They can then convert lactose to glucose and galactose via beta galactosidase which can be used to
respire

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