The Ames Test Is Used to Measure the Mutagenicity of Molecules

question 23

Multiple Choice

The Ames test is used to measure the mutagenicity of molecules by introducing a potential mutagen to a culture of bacteria that cannot synthesize histidine. Which of the following explains the results if the bacteria are able to grow in a medium that lacks histidine?

• A)all proteins expressed by the bacteria have mutated to not require histidine
• B)defective histidine synthesis genes are mutated to forms that allow for histidine synthesis
• C)the mutagen causes the bacteria to use some other molecule in place of histidine
• D)the bacteria can convert the potential mutagen into histidine
• E)none of the above

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