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As in many instances in biology, there are bacteria that do not follow this rule.
Many bacteria, such as Vibrio, are monoflagellated and have a single flagellum at one pole of the cell.
Their method of chemotaxis is different.
Others possess a single flagellum that is kept inside the cell wall.
These bacteria move by spinning the whole cell, which is shaped like a corkscrew.

1.970 seconds.