Motile cells are biflagellated but the …

A flagellum (/fləˈdʒɛləm/; plural: flagella) is a lash-like appendage that protrudes from the cell body of certain bacteria and eukaryotic cells termed as flagellates. A flagellate can have one or several flagella. Flagella are key structures concerned with bacterial motility. Nevertheless, bacteria that lack flagella may still be motile. A type of gliding motility can be achieved by the flexible movement of the whole cell. This is mainly observed on solid media, whereas flagellar motion is common to liquid environments. The primary purpose of cilia in mammalian cells is to move fluid, mucous, or cells over their surface. Cilia and flagella have the same internal structure. The major difference is in their length. Cilia and flagella move because of the interactions of a set of microtubules inside.