Peroxides frequently react to form free radicals. A. Testing chemicals to see if they're bad. Test developed by Bruce Ames. If a chemical mutates DNA in bacteria, it can cause cancer. Chemical is put on a culture dish with the bacteria, and you wait to see if the bacteria get any mutations.
Liver enzymes can convert a chemical that is OK to a carcinogen.
You can test if a chemical would be converted to a carcinogen by liver enzymes acting on it. Just put liver enzymes with the chemical in the culture dish with the bacteria. B. Cigarette smoke has approximately 50 carcinogenic chemicals out of 2,000 total chemicals. C. Air pollution from car exhaust or industrial pollution is a source of carcinogens. D. Drinking water has carcinogens which are chlorinated compounds formed because of chlorinating the water to kill bacteria and viruses.