Imagine That You've Set Up a Genetic Screen to Identify

question 32

Multiple Choice

Imagine that you've set up a genetic screen to identify E. coli mutants that cannot metabolize the amino acid tryptophan. Beginning with a master plate containing many colonies, you prepare replica plates on medium with glucose or tryptophan as the only energy source. You would look for colonies that

• A) can grow only on the plates with tryptophan.
• B) cannot grow on either type of media.
• C) can grow on both types of media.
• D) can grow only on the plates with glucose.

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Definitions:

Case History

A comprehensive record of an individual’s background, symptoms, medical history, and treatment, often used in clinical and psychiatric settings.

Rare Behavior

A behavior that is not commonly observed or exhibited by the majority within a population.

Demand Characteristics

Subtle cues or signals in an experimental environment that influence participants' behaviors or responses.

Independent Variables

Factors or conditions that are manipulated or controlled by researchers to determine their effects on dependent variables.