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

Options

A. Transacetylase
B. Lactose permese and transacetylase
C. `beta`-galactosidase
D. Lactose permease

Answer

C

Explanation

In the lac-operon, there are three structural genes -Z, 'y' and 'a'. They are translated in sequence (i.e., first Z then y then a0gt 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 by Z (i.e., b balactosidase) will be produced. the other two enzymes (i.e., 'y' coding for) permease and ('a' coding for) transacetylase will not be produced.