What is bacterium?

Bacterium is any of various one-celled microorganisms of the plant kingdom, existing as free-living organisms or as parasites, multiplying by subdivision, and having a large range of biochemical properties. They are classified according to their shape into: bacilli, cocci, spirilla , and vibrios; they are further classified on the basis of staining characteristics, colony morphology, and metabolic behavior.
enteric b. A bacterium indigenous to the intestines, usually a nonpathogenic gram-
negative rod.
L-forms of bacteria Small, filterable bacterial forms with defective or absent cell
walls which retain the ability to multiply.

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