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How to sign: (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered plants
Similiar / Same: bacterium
Within this category: acidophil, bacteroid, Calymmatobacterium, diplococcus, Francisella, gonococcus, Legionella pneumophilia, nitrobacterium, penicillin-resistant bacteria, Rickettsia, rod