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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 .

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(i) A low level of lac operon occurs due to the absence of formation of permeases. Permeases are necessary for the transport of lactose from medium into cells. Due to the failure of transport of lactose into the cell, ti will not act as inducer.
(ii) Although lactose can induce the expression of lac operon, the level of expression is very low. The reason for this is that the lac operon is subject to catabolite repression or the reduced expression of genes brought on by growth in the presence of glucose.
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