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Which enzymes will be produced in a cell in which there is a nonsense mutation in the lac Y gene?

1. Lactose permease
2. Transacetylase
3. Lactose permease and transacetylase
4. β- galactosidase

Correct answer: β- galactosidase

Solution

A nonsense mutation in lacY creates a premature stop codon, so lactose permease is not produced. The lacZ gene is separate and still functional, so β-galactosidase can still be made.

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