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

Options

A. (a) Transacetylase
B. (b) Lactose permease and transacetylase
C. (c) `beta`- galactosidase
D. (d) Lactose permease

Answer

3

Explanation

In the lac - operon, there are three structurnal genes - Z, 'y' and 'a' . They are translated in sequence (i.e., first then y then (1)). If there is a non sense mutation in the 'y' gene , then only Z will get translated and y and a will not get translated . Therefore only the enzyme coded (i.e., galactosidase) will be prodeced . The other two enzyme (i.e., coding for ) Permease and ('a' coding for ) transacetylase will not be prodeced