Questions
Which enzyme will be produced in a cell if there is a nonsense mutation in the lac Y gene?
a
Transacetylase
b
Lactose permease and transacetylase
c
β-galactosidase
d
Lactose permease
detailed solution
Correct option is C
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.Talk to our academic expert!
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Number of regulatory and structural genes present in lac operon are
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