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Question
The lac operon contains the z, y and a structural genes
Options:
A .  encoding p-galactosidase, galactose permeases and thio-galactosidase transacetylase respectively
B .  encoding P-galactosidase only
C .  None of these
D .  encoding p-galactosidase and galactose permeases
Answer: Option A

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