A Mutant E

question 39

Multiple Choice

A mutant E. coli strain, grown under conditions that normally induce the lac operon, produces particularly high amounts of ß-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:

Survey

A research method in which information is collected from a large number of people by interviews, written questionnaires, or some other means.

Scientific Method

A systematic and logical approach to discovering how things in the universe work, involving making observations, forming a hypothesis, conducting experiments, and making conclusions.

Developing

A descriptor for countries or regions undergoing economic, industrial, and social progress, often with rapid growth and improvement in living standards.

Hypothesis

A proposed explanation made on the basis of limited evidence as a starting point for further investigation.