In Jacob and Monad’s analysis of mutant E. coli strains in their study of the lac operon, the absence of the ?-

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


b

Biology & Microbiology

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