First slide

Regulation of Gene Expression

Question

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

Moderate

A

Transacetylase
B

Lactose permease and transacetylase
C

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

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