bacteria definition
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A bacterium is a single-celled (unicellular) microorganism that does not have a nucleus or any other membrane-bound organelles. Bacteria are sometimes called 'prokaryotes.' In Greek, 'prokaryote' literally means 'before the nut' (where 'the nut' is the nucleus.)
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bacteria constitute a large domain of prokaryotic microorganisms . typically a few micrometres in length , bacteria have a number of shape , ranging from spheres to rods and spiral.
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