False about bacillus anthrax is: (A) Gram negative, (B) Bacilli in long chain, (C) Non haemolytic colony in blood agar, (D) Medusa head appearance on nutrient agar
Answer is A. The Bacillus anthrax is one of the largest of pathogenic bacteria. It is Gram-positive but tends to be decolorized easily so as to appear Gram-variable or even Gram-negative. It is non-acid fast. It is non-motile. Reference: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg: 249