Botany Which enzyme will be produced in a cell if there is a non-sense mutation in the lac Y gene?

Which enzyme will be produced in a cell if there is a non-sense mutation in the lac Y gene?

A
Transacetylase
B
Lactose permease and transacetylase
C
$β$ -galactosidase and transacetylase
D
Lactose permease

Solution:

A non-sense mutation creates stop codon. So, somewhere in the lac y gene a stop codon will be created. Therefore, lac z gene will be translated completely and beta galactosidase is formed but not lac y. lac a is also translated and transacetylase is formed.