Explain the structure and movement of Rukaryotic flagella.

Explanation

(i) Eukaryotic Flagella are enclosed by unit membrane and it arises from a basal body Flagella is composed of outer nine pairs of microtubules with two microtubules in its centre (9+2 arrangement).
(ii) Flagella are microtubule projection of the plasma membrane. Flagellum is longer than um (as long as 200`mu`m). The structure of flagellum has an axoneme made up microtubules and protein tubulin.
Movement: Outer microtubule doublet is associated with axonemal dynein which generates force for movement. The movement is ATP driven. The interaction between tubulin and dynein is the mechanism for the contraction of cilia and flagella. Dynein molecules uses energy from ATP to shift the adjacent microtubules. This movement bends the cilium or flagellum.