E Coli Colonies Grown on a Lactose-Containing Medium Up-Regulate the Production

question 58

Multiple Choice

E. coli colonies grown on a lactose-containing medium up-regulate the production of the enzymes β-galactosidase and galactoside permease.  Which of the following best explains the synchronous production of both enzymes in response to lactose?

• A)There are two activator binding sites for one activator protein
• B)There are two operators for one repressor protein
• C)There are two repressors for one inducer
• D)There are two promoters in close proximity to each other
• E)There is one mRNA coding for both enzymes

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