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A flagellum (/ f l ə ˈ dʒ ɛ l əm /; pl.: flagella) (Latin for 'whip' or 'scourge') is a hair-like appendage that protrudes from certain plant and animal sperm cells, from fungal spores (), and from a wide range of microorganisms to provide motility.
Bacterial flagella are helical filaments, each with a rotary motor at its base which can turn clockwise or counterclockwise. [16] [17] [18] They provide two of several kinds of bacterial motility. [19] [20] Archaeal flagella are called archaella, and function in much the same way as bacterial flagella
Flagella in eukaryotes are supported by microtubules in a characteristic arrangement, with nine fused pairs surrounding two central singlets. These arise from a basal body. In some flagellates, flagella direct food into a cytostome or mouth, where food is ingested. Flagella role in classifying eukaryotes.
Cells of Chlorophyceae usually have two or four flagella, but in some cases may have numerous flagella. The flagella emerge from the apex of the cell, and are connected to the nucleus via rhizoplasts. [2] The arrangement of flagella may be in one of two configurations, termed CW ("clockwise") or DO ("directly opposed").
Flagellins are a family of proteins present in flagellated bacteria [1] which arrange themselves in a hollow cylinder to form the filament in a bacterial flagellum. Flagellin has a mass on average of about 40,000 daltons. [2] [3] Flagellins are the principal component of bacterial flagella that have a crucial role in bacterial motility.
Motility protein A (MotA), is a bacterial protein that is encoded by the motA gene.It is a component of the flagellar motor. [1] More specifically, MotA and MotB make the stator of a H + driven bacterial flagella and surround the rotor as a ring of about 8–10 particles.
Another pattern of flagella adherence involves flagella emerging from flagellar folds, which are grooves that run parallel to the cell, and then attaching to each other. [3] [20] Another key component of a Trichonympha cell is the basal body and parabasal fibres. Trichonympha has long basal bodies which give rise to the flagella. [22]
A polar organelle is a structure at a specialised region of the bacterial polar membrane that is associated with the flagellar apparatus. [ 1 ] [ 2 ] This flagellum-associated structure can easily be distinguished from the other membrane regions in ultrathin sections of embedded bacteria by electron microscopy when the cell membrane is ...