A Mutant E $\beta$ -Galactosidase

question 30

Multiple Choice

A mutant E.coli strain, grown under conditions that normally induce the lac operon, produces high amounts of $\beta$ -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)lacI^- lacP⁺ lacO⁺ lacZ^- lacY⁺ lacA⁺
• D)lacI⁺ lacP^- lacO⁺ lacZ⁺ lacY⁺ lacA⁺
• E)lacI^- lacP^- lacO⁺ lacZ^- lacY⁺ lacA^-

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Definitions:

Manufacturing Overhead

Indirect manufacturing costs such as the expenses for factory maintenance and equipment depreciation.

Raw Materials Used

The total value of all raw materials consumed in the production process over a specified period.

Factory Depreciation

The systematic allocation of the cost of physical assets used in the manufacturing process over their useful lives.

Direct Labour

The cost of wages for employees directly involved in the production of goods or services.