Unformatted text preview: A mutant that now requires a specific growth factor that previously could be synthesized is called an auxotroph. IDENTIFYING CHEMICAL CARCINOGENS Carcinogens are mutagens that cause cancer. One way of identifying these is the Ames test. The chemical being tested is added to medium containing mutant bacteria. If the chemical is mutagenic, it will cause more than a random number of mutants to revert to their original form (back-mutations or reversions). The more of these, the more powerful the mutagen. About 90% of the chemicals that are positive on this test will be carcinogens....
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- Fall '09
- 90%, Carcinogen, Mutagen, mutants