The flagella are very long and thin filamentous appendages, which allow the bacteria to move. Formed by a protein called flagellin, they have a simpler structure than that of eukaryotes.
Depending on where the flagella are located, the following bacteria are distinguished:
- Monotric: they only have one scourge. (A)
- Lophometric: they have several flagella, but very close. (B)
- Amphiphitic: they have a single flagellum at each opposite end. (C)
- Peritric: they have several flagella distributed throughout the bacterial surface. (D)
Bacterial flagella are much simpler than those of eukaryotic cells. In them two parts are distinguished: the basal area and the stem.
By LadyofHats [Public domain], via Wikimedia Commons
They are short, hollow tubes, made up of proteins that appear on the outer surface of some Gram negative bacteria.
The fimbriae are short and very numerous, and they serve so that the cell can attach itself to the substrate.
The pili are long and only one or two appear per bacterium. In the conjugation process, they intervene in the exchange of genetic material with other bacteria.
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