explain the structure of centriole( cart wheel structure).
Answers
The cartwheel is a subcentriolar structure consisting of a central hub and nine radially arranged spokes, located at the proximal end of the centriole. It appears at the initial stage of the centriole assembly process as the first ninefold symmetrical structure
Centrosome and Centrioles:
Centrosome contains two cylindrical structures called centrioles.
They are surrounded by amorphous pericentriolar material.
Both centrioles in centrosome lie perpendicular to each other.
Each centriole is made up of 9 peripheral triplet fibrils of tubulin proteins.
No microtubule occurs in the centre; giving (9+0) pattern of microtubules.
All peripheral triplets are joined to each other through linkers.
Central part of centrioles is called hub, which is connected to peripheral triplets by radial spokes.
Note:
Cytoplasm around centrioles lacks other organelles, forming a region called centrosphere.
Before cell division, centrioles duplicate so that dividing cell has a pair of centrioles at each pole of spindle.
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