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What is The "String of pearl" colonies on Nutrient agar is produced by - and explain in detail?
Ans. is 'c' i.e., Bacillus String of pearl reactiono String of pearl reaction is used to differentiate B. anthracis from B. cereus and other aerobic spore forming bacteria,o When B. antharcis is grown on a solid medium containing penicillin, the cells become larger, spherical and occur in chains on the surface of the agar, resembling a string of pearls.Important characteristic feature of B. Anthraciso Gram positiveo Non-motile fall other members of genus Bacillus are motile)o Polypeptide capsuleo "Frosted glass appearance " of cultureo "Invertedfor tree appearance " of cultureo Medusa head colonieso String of pearl's reactiono "Cut glass appearance"o MTadyean's reactiono Selective media - PLET medium