<prompt> Medusa head colonies on nutrient agar is seen in?PneumococcusLegionellaBrucellaAnthrax  <response>: Ans. is d i.e., Anthrax BACILLUS ANTHRACIS Morphology ? Gram positive Non motile all other members of genus Bacillus are motile Arranged singly, in pairs or in sho chains Capsulated - entire chain being surrounded by a capsule. - Capsule is polypeptide Sporing - Spores are formed in culture or in soil but never in animal body during life. Chain of bacilli presents a bamboo stick appearance. 