NEET BIOLOGY

Detailed explanation-1: -Streptococci are spherical organisms that grow in chains because of incomplete separation after division of the cells (Figure 1).

Detailed explanation-2: -Streptococci are non-motile, microaerophilic, Grampositive spherical bacteria (cocci). They often occur as chains or pairs and are facultative or strict anaerobes.

Detailed explanation-3: -Gram-positive cocci include Staphylococcus (catalase-positive), which grows clusters, and Streptococcus (catalase-negative), which grows in chains.

Detailed explanation-4: -Streptococcus pyogenes (Group A streptococcus) is a Gram-positive, nonmotile, nonsporeforming coccus that occurs in chains or in pairs of cells. Individual cells are round-to-ovoid cocci, 0.6-1.0 micrometer in diameter (Figure 1).