A Mutation in the Lac Operator That Blocks the Binding

question 7

Multiple Choice

A mutation in the lac operator that blocks the binding of the lac repressor [all of the following EXCEPT]:

• A) causes constitutive expression of the z gene.
• B) leads to an inactivation of the lac repressor protein.
• C) eliminates the transcriptional induction of the z gene by allolactose.
• D) causes constitutive expression of the permease gene (y gene).
• E) is active only in a cis arrangement.

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