Which One of the Following Statements About Mutations in the Lactose

question 2

Multiple Choice

Which one of the following statements about mutations in the lactose operon is NOT correct?

• A)A lacI mutant would result in the loss of expression of repressor protein.
• B)A lacI mutant would allow continuous or constitutive expression of both  -galactosidase and lactose permease.
• C)A mutation in the lacO sequence would allow continuous or constitutive expression of both  -galactosidase and lactose permease.
• D)In cells containing one mutant and one normal copy of lacI, the repressor is still expressed and lacZ and lacY will be expressed only in the presence of lactose.
• E)In cells containing one mutant and one normal copy of lacO, lacZ and lacY are expressed only in the absence of lactose.

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