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A low level of expression of lac operon ...

A low level of expression of lac operon occurs at all the time in E-coli. Justify the statement.

Text Solution

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One of the enzyme synthesized by lac operon is permease which is involved in the transport of lactose into the cells. If the lac operon gets inactivated, permease is not synthesized hence lactose cannot enter the cell. Lactose acts as a inducer, binding to the repressor protein and switch on the operator to initiate gene expression.
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