Fimbriae, flagella, and pili are all examples of external structures found in some bacteria.
At the surface of bacterial cells are long filamentous polymeric protein structures called fimbriae. It is an external structure of bacteria.
They make it possible for the bacteria to attach to particular receptor structures and colonize particular surfaces.
The primary function of the flagellum is to facilitate mobility and chemotaxis.
Bacteria can have one or more flagella and can either be polar (having one or more flagella in a single location) or peritrichous (several flagella all over the bacterium).
Fimbriae, or pili, are filamentous, proteinaceous organelles that are expressed on the surface of bacteria. They range in length from a few hundredths of a micrometer to more than 20 millimeters, and their diameter ranges from 2 to 11 nm.
Their roles include regulating DNA absorption, motility, and cell-to-cell interactions.
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