Q.

What effect would you expect if gene expression of the lac operon was completely repressed ?

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a

Lactose would not behave as inducer and the operon could not be induced.

b

Lactose would be converted into the inducer and the operon could be induced

c

The cell would be more efficient without 'wasting' the energy required for the low level of Lac Z, LacY, and Lac A gene expression.

d

Allolactose would accumulate within the cell and become toxic.

answer is C.

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Detailed Solution

A low level of Lac Z expression is required for conversion of lactose to the inducer, allolactose.

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