What Type of Procedure Is Appropriate to Isolate Revertants from a Population

question 92

Multiple Choice

What type of procedure is appropriate to isolate revertants from a population of threonine auxotrophic cells?

• A)Grow the auxotrophic cells on an agar plate without threonine; any colonies that form are presumed revertant.
• B)Grow the auxotrophic cells on and agar plate with threonine; any colonies that form are presumed revertant.
• C)Grow the auxotrophic cells in broth with threonine; if the broth becomes cloudy,revertants are presumed present.
• D)Threonine auxotrophic revertants could not be isolated on any type of media.

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Definitions:

Interaction Effect

A phenomenon in statistics where the effect of one independent variable on a dependent variable differs depending on the level of another independent variable.

Main Effect

The direct influence of an independent variable on a dependent variable in an experimental design.

Simple Effect

The effect of one variable at a specific level of another variable in a factorial experiment.

Interaction Effect

In statistics, the effect that exists when two or more variables combine to affect the outcome of a dependent variable in a way that cannot be simply added.