In Jacob and Monad's Analysis of Mutant E

question 1

Multiple Choice

In Jacob and Monad's analysis of mutant E. coli strains in their study of the lac operon, the absence of the β-galactosidase enzyme, but presence of the lactose permease and galactosidase transacetylase enzymes, indicated that the mutation occurred in the _____ of the lac operon.

• A) regulatory region
• B) lacZ gene
• C) lacA gene
• D) lacY gene
• E) heterochromatin

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