Assume That a Mutation Occurs in the Promoter for the LacI

question 30

Multiple Choice

Assume that a mutation occurs in the promoter for the lacI regulatory gene and this mutation results in a tenfold increase in the transcription of lacI. What would be the expected consequences of such a mutation?

• A) The lac structural genes will be fully expressed even in the presence of glucose and absence of lactose.
• B) The lac operon would be expected to be regulated normally.
• C) The lac structural genes will not be fully induced even in the absence of glucose and presence of lactose.
• D) The lac structural genes will be partially expressed in the presence of glucose and fully expressed if lactose is also present.
• E) The lac structural genes will now be fully expressed in the absence of glucose and lactose but not expressed in the absence of glucose and presence of lactose.

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