A Mutant E $\beta$ -Galactosidase

question 24

Multiple Choice

A mutant E.coli strain, grown under conditions that normally induce the lac operon, does not produce $\beta$ -galactosidase.What is a possible genotype of the cells?

• A)lacI⁺ lacP⁺ lacO⁺ lacZ⁺ lacY^- lacA⁺
• B)lacI⁺ lacP⁺ lacO^c lacZ⁺ lacY⁺ lacA⁺
• C)lacl⁺ lacP⁺ lacO⁺ lacZ⁺ lacY⁺ lacA⁺
• D)lacI⁺ lacP^- lacO⁺ lacZ⁺ lacY⁺ lacA⁺
• E)lacI^_ lacP⁺ lacO^-lacZ⁺ lacY⁺ lacA^-

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Definitions:

Market Equilibrium

A condition in a market where the quantity demanded equals the quantity supplied, leading to no pressure for price to change.

Minimum Price

The lowest possible price at which a good or service can be sold, often set by legal or regulatory authorities to protect producers or consumers.

Deadweight Loss

A loss of economic efficiency that occurs when the equilibrium for a good or a service is not achieved or is not achievable.

Government Cost

Government cost refers to the expenses incurred by the government in the course of its operations, including public services, defense, infrastructure, and social programs.