A Mutation in the LacI Gene Results in an Active

question 17

Multiple Choice

A mutation in the lacI gene results in an active repressor protein that can no longer bind allolactose.Which would be true of the phenotype of the mutant strain?

• A) It would be constitutive for β-galactosidase expression.
• B) It would overexpress LacZ.
• C) It would be the same as the wild-type strain.
• D) It would repress β-galactosidase when lactose is present.
• E) It would be overexpress β-galactosidase when lactose is present.

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Definitions:

Pyridine

A basic nitrogen-containing heterocyclic compound, resembling benzene but with one CH group replaced by a nitrogen atom.

Thionyl Chloride

A reactive chemical compound used widely in organic synthesis to convert carboxylic acids into acyl chlorides.

Trans-4-methylcyclohexanol

An organic compound characterized by a cyclohexane ring with a methyl group and hydroxyl group in trans configuration relative to each other.

Organic Product

A substance resulting from an organic reaction, often characterized by its carbon-based structure.