Which of the Following Best Describes Expression of the Lac

question 42

Multiple Choice

Which of the following best describes expression of the lac genes in this partial diploid? I+ P+OC Z- Y+/ I- P+ O+ Z+ Y-

• A) β- galactosidase is made both in the presence and absence of lactose, but permease is only made when lactose is present.
• B) Both β- galactosidase and permease are not made whether lactose is present or not.
• C) β- galactosidase is only made when lactose is present, but permease is made both in the presence and absence of lactose.
• D) Both β- galactosidase and permease are made both in the presence of and in the absence of lactose.
• E) Both β- galactosidase and permease are made only when lactose is present.

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