Write a note on Flagella, Pili, Fimbriae.

Explanation

Flagella : Bacterial cells may be motile or non-motile.
If motile, they have thin filamentous extensions from their cell wall called flagella.
Bacteria show a range in the number and arrangement of flagella.
Bacterial flagellum is composed of three parts – filament, hook and basal body.
The filament is the longest portion and extends from the cell surface to the outside.
Pili and Fimbriae are also surface structures of the bacteria but do not play a role in motility.
Pili : The pili are elongated tubular structures made of a special protein.
Fimbriae : The fimbriae are small bristle like fibres sprouting out of the cell. In some bacteria, they are known to help attach the bacteria to rocks in streams and also to the host tissues.