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Q.

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

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a

Transacetylase

b

Lactose permease and transacetylase

c

β-galactosidase

d

Lactose permease

answer is C.

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Detailed 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 but not lac y and lac a gene. As a result, only β-galactosidase will be produced.

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