Almost all spiral bacteria and half of the bacilli are motile form and the cocci are non motile type.
Electron microscope study shows that flagella has three parts namely filament ,hook and basal body . The filament consist of three or more longitudinal fibril of fibrous protein called flagellin which are twisted to form a core . The basal end of filament is attached to hook which in turn attached tobasal body also called kinetoplast. The basal body is made up of a rod and two or more rings which are for attaching with cellwall and cellmembrane.
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