A Mutation in the LacI Gene Results in an Active

question 43

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:

Herfindahl Indexes

A measure used to calculate the level of concentration in a market, indicating the competitive environment and potential for monopolistic power.

Four-Firm Concentration Ratio

A measure that indicates the total market share held by the largest four firms in an industry, used to assess the level of competition.

Product Differentiation

Product differentiation is the process of distinguishing a product or service from similar offerings in the market to make it more attractive to a particular target market.