<prompt> Stain is not taken by capsule in gram negative organisms because the capsule consist ofPolysaccharidesLipopolysaccharidesLipidsAll  <response>: Ans. is a i.e., Polysaccharides . Capsules are protective walls that surround the cell membranes of gram-positive and gram-negative bacteria. . They are usually composed of simple sugar polysaccharide except in Bacillus anthracis it is made up of polypeptide protein. . Capsule is not visible in gram stained smear as it has little affinity for basic dyes. Note? . For single option go ahead for option a, i.e. polysaccharide because, except for Bacillus anthracis, the capsule of almost all the impoant bacteria is composed of sugar polysaccharide. . Dont get confuse with word gram-negative in question because the capsule, whether it is of gram positive or gram negative bacteria, is not visible on gram staining. 