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===Meaning===
[[File:Bacteria.png|right|300px|thumb|A [[Magnify|magnified]] image of several '''bacteria'''.]]
Bacteria are [[unicellular]] [[micro-organism]]s that have no [[nucleus]], [[mitochondria]] or [[chloroplast]] but do have [[cytoplasm]], a [[cell membrane]] and a [[Cell Wall|cell wall]].
: Singular [[Noun]]: '''Bacterium'''