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A bacterium's shape can give the bacterium some advantages. For example, spiral bacteria can move through fluids more easily than can cocci or bacilli bacteria. Furthermore, bacteria can be classified by their growth characteristic patterns (Groupings). The prefix diplo-denotes cells arranged in pairs. The prefix staphylo-describes bacteria arranged in clusters like grapes. The prefix strepto-denotes bacteria arranged in a chain.
Prokaryotic cells have various shapes; the four basic shapes are: Cocci - spherical Bacilli - rod shaped Spirochaete - spiral shaped Vibrio - comma shaped.