Consider the Following Experiment

question 22

Multiple Choice

Consider the following experiment. First, large populations of two mutant strains of Escherichia coli are mixed, each requiring a different, single amino acid. After plating them onto a minimal medium, 45 colonies grew. Which of the following may explain this result?

• A) The colonies may be due to back mutation (reversion).
• B) The colonies may be due to recombination.
• C) Either A or B is possible.
• D) Neither A nor B is possible.

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Definitions:

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The process of becoming physically or psychologically dependent on a substance or behavior, leading to compulsive engagement despite harmful consequences.

Methaqualone

A sedative and hypnotic medication popular in the past, now banned in many countries due to high potential for abuse.

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A potent central nervous system stimulant often used recreationally and as a second-line treatment for attention deficit hyperactivity disorder and obesity.

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