In addition to the Gram stain, microorganisms are also classified according to colony morphology and cellmorphology. Bacterial colonies grow from a single cell and are composed of millions of cells. Each colonyhas a characteristic size, form or shape, edge, texture, degree of opacity, and color. These characteristicsdescribe the morphology of a single colony and may be useful in the preliminary identification of a bacterialspecies. Colonies with a markedly different appearance (when grown on the same medium) can be assumedto contain different bacterial species. However, since many species have a similar colony morphology, thereverse (that colonies that look alike are the same species) is not always true. Figure 3 shows some ofthe terms used to describe colony morphology.
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