10. Why does acridine orange appear mutagenic in Salmonella Stain B but not in Salmonella Strain A? Why does sodium nitrite appear mutagenic in Salmonella Strain A but not in Salmonella Strain B. Explain.

The Ames test, named for its designer, Bruce Ames, is a technique to test synthetic compounds for their disease causing properties. Three analyzer strains are utilized for this reason - Escherichia coli , Salmonella typhimurium strain An and strain B. E. coli distinguishes base pair substitution change though Salmonella typhimurium strain B identifies frameshift transformation and strain A recognizes base pair substitution change. Acridine orange intercalates itself between adjoining bases and contorts DNA helix, subsequently causes additions and erasures during replication process. Along these lines it is utilized to decide frameshift change and this is the reason it seems mutagenic in Salmonella strain B yet not strain A. Sodium nitrite deaminates cytosine to deliver uracil and uracil thus matches with adenine shaping a CG to TA progress. Along these lines it is utilized to decide base pair substitution and that is the reason it seems mutagenic in Salmonella strain A yet not recolor B.