The chromosome of a bacterial cell possesses the following genotype with regard to the lac operon: I?O+Z+Y?A?. This bacterial cell would
A) make ?-galactosidase in the presence of lactose.
B) make ?-galactosidase independently of lactose.
C) make ?-galactosidase and galactoside permease in the presence of lactose.
D) make transacetylase in the presence of lactose.
E) make no lac gene products.
Answer: B
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