Flagellum | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-03

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Flagellum


00:01:25 1 Types
00:02:39 1.1 Bacterial
00:02:47 1.1.1 Structure and composition
00:04:42 1.1.2 Motor
00:07:26 1.1.3 Assembly
00:07:56 1.1.4 Evolution
00:09:13 1.1.5 Flagella and the intelligent design debate
00:10:43 1.1.6 Flagellar arrangement schemes
00:14:12 1.2 Archaeal
00:16:53 1.3 Eukaryotic
00:17:02 1.3.1 Terminology
00:17:54 1.3.2 Internal structure
00:19:19 1.3.3 Mechanism
00:20:04 1.3.4 Flagella versus cilia
00:20:49 1.3.5 Intraflagellar transport
00:21:15 1.3.6 Evolution and occurrence
00:23:12 1.3.7 Typology
00:27:12 2 See also



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SUMMARY
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A flagellum (; 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. The primary function of a flagellum is that of locomotion, but it also often functions as a sensory organelle, being sensitive to chemicals and temperatures outside the cell. The similar structure in the archaea functions in the same way but is structurally different and has been termed the archaellum.Flagella are organelles defined by function rather than structure. Flagella vary greatly. Both prokaryotic and eukaryotic flagella can be used for swimming but they differ greatly in protein composition, structure, and mechanism of propulsion. The word flagellum in Latin means whip.
An example of a flagellated bacterium is the ulcer-causing Helicobacter pylori, which uses multiple flagella to propel itself through the mucus lining to reach the stomach epithelium. An example of a eukaryotic flagellate cell is the mammalian sperm cell, which uses its flagellum to propel itself through the female reproductive tract. Eukaryotic flagella are structurally identical to eukaryotic cilia, although distinctions are sometimes made according to function or length. Fimbriae and pili are also thin appendages, but have different functions and are usually smaller.