In the Ames test for mutagenicity
A)auxotrophic bacteria are converted to prototrophs that survive.
B)prototrophic bacteria are converted to auxotrophs that survive.
C)cells are treated with mutagen and only those with no mutations survive
D)cells are treated with excess amino acids, killing cells that carry mutations.
E)rat liver enzymes protect cells from mutation

Question

Quizplus · Accepted Answer

The Ames test uses auxotrophic bacteria which require specific nutrients they cannot produce for survival. These bacteria are exposed to a substance suspected of being a mutagen, and the number of revertant colonies that occur is counted. The test measures whether the substance causes mutations that convert the auxotrophic bacteria to prototrophic bacteria, which do not require the additional nutrient and can grow and form colonies. Therefore, option A is the correct answer.

In the Ames Test for Mutagenicity