Final answer:
In an Ames test, bacteria that start producing histidines are called revertants. The Ames test is a method that uses bacteria to identify mutagenic and potentially carcinogenic chemicals.
Step-by-step explanation:
The subject of this question is Biology.
In an Ames test, bacteria that start producing histidines are called revertants.
The Ames test is a method that uses bacteria to identify mutagenic and potentially carcinogenic chemicals. In the test, a strain of Salmonella typhimurium that is a histidine auxotroph (unable to synthesize its own histidine) is exposed to a potential mutagen. The number of bacteria that regain the ability to synthesize histidine is counted and compared to the number of such mutants that arise in the absence of the potential mutagen. Chemicals that are more mutagenic will bring about more histidine synthesis revertants in the Ames test.