In the Ames Test,mutagenicity Is Normally Tested on a Strain

question 31

Multiple Choice

In the Ames test,mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine.Therefore,these bacteria require histidine in the growth plate to survive.A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that in the presence of the new compound,several colonies of Salmonella typhimurium is living on the histidine-free growth plate.What can be assumed from these results?

• A)The newly synthesized compound induced a mutation in the bacteriA.
• B)The bacteria no longer produce histidine.
• C)The bacteria now produce histidine.
• D)The newly synthesized compound induced a mutation in the bacteria and the bacteria no longer produce histidine.
• E)The newly synthesized compound induced a mutation in the bacteria and the bacteria now produce histidinE.

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