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Under minimal conditions, the cell has fewer than 5 copies of enzyme β-galactosidase.

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Under minimal conditions, the cell has fewer than 5 copies of enzyme β-galactosidase.

(a) True

(b) False

The question was asked in an online interview.

This interesting question is from Gene Expression Control in portion Control of Gene Expression of Cell Biology

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Right choice is (a) True

Explanation: Under minimal conditions, when glucose is present as an energy source there is no need for the cell to utilize lactose. Under such conditions an average cell contains fewer than 5 copies of enzyme β-galactosidase and single copy of associated mRNA.

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