Flagella are organs for movement in bacteria. Electron microscopic studies revealed that flagella consist of three components: a long filament made up of protein flagellin, a hook that connects the filament to the basal body and basal body embedded in the cell wall and plasma membrane from where the flagellum arises.
Flagella, pili and fimbriae

 Archaebacterial flagella vs Eubacterial flagella
1. Eubacterial flagella is thicker than archae bacterial flagella.
2. Eubacterial flagella is powered by flow of H+ ions.
    Archaebacterial flagella is ATP driven.
3. Eubacteria possess many flagellar filaments that rotates independently.
    Archae flagella are often bundled composed of many filaments that rotate as a single unit.
4. During growth of flagella, flagellin subunits are added at the tip in Eubacterial flagella where as in archeal flagella, flagellin subunits are added at the base.

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