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Which enzymes will be produced in a cell in which there is a nonsense mutation in the lac Y gene?
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- Lactose permease
- Transacetylase
- Lactose permease and transcetylase
- β- galactosidase
Correct Option: D
A nonsense mutation is the one which stops polypeptide synthesis due to formation of a terminating or non sense codon. e.g. ATT(UAA), ATC (UAG), ACT(UGA). The lactose or lac operon of Esherichia coli contains structural genes (Z, Y, A). If Y codes for termination of polypeptide chain then only the product of ‘Z’ gene transcribe to form β galactosidase.
