The proteins and polysaccharides that make up a bacterium are sometimes characteristic enough to be considered identifying markers. The most useful of these are the molecules that make up surface structures including the cell wall, glycocalyx, flagella, and pili. For example, some species of Streptococcus contain a unique carbohydrate molecule as part of their cell wall that can be used to distinguish them from other species. These carbohydrates, as well as any distinct proteins or polysaccha-

Nester-Anderson-Roberts: I II. The Microbial World I 10. Identification and I I © The McGraw-Hill

Microbiology, A Human Classification of Companies, 2003

Perspective, Fourth Edition Prokaryotes

Gram stain



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