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Medium #1 Contains Lactose

Question 27

Multiple Choice

Medium #1 contains lactose.Medium #2 contains no lactose.Which of the following strains will produce a different level of β-galactosidase activity on medium #1 as on medium #2?


A) lacIs,lacOc
B) lacIs,lacZ+
C) lacI+,lacZ-
D) lacIs,lacZ-
E) lacI+,lacZ+

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