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NEET CELL 13 Centrosome

Centrosomes are organelles containing two perpendicular centrioles, which are structured like a cartwheel with nine triplet peripheral fibrils made of tubulin. They play a crucial role in forming the basal body of cilia and flagella, as well as spindle fibers during cell division in animal cells. Centrioles are found in most eukaryotic cells but are absent in higher plant cells.

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62 views1 page

NEET CELL 13 Centrosome

Centrosomes are organelles containing two perpendicular centrioles, which are structured like a cartwheel with nine triplet peripheral fibrils made of tubulin. They play a crucial role in forming the basal body of cilia and flagella, as well as spindle fibers during cell division in animal cells. Centrioles are found in most eukaryotic cells but are absent in higher plant cells.

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Centrosome and Centrioles

Centrosome is an organelle usually containing two cylindrical structures called centrioles.


They are surrounded by amorphous pericentriolar materials.
centriole
Both the centrioles in a centrosome lie perpendicular to each other
each has an organisation like the cartwheel.
peripheral fibrils
made up of nine evenly spaced peripheral fibrils of tubulin protein
Each of the peripheral fibril is a triplet.
The adjacent triplets are also linked.

hub
The central part of the proximal region of the centriole is also
proteinaceous and called the hub,
connected with tubules of the peripheral triplets by radial spokes
made of protein

Function
The centrioles form the basal body of cilia or flagella, and spindle fibres
that give rise to spindle apparatus during cell division in animal cells.

Other centrosphere or kinoplasm.

two centrioles called diplosome, are localised in the centrosome at right angles to each other.
The centrioles are found in almost all eukaryotic cells like animal cells, fungi and algae but not found in higher plant cells.
nine evenly spaced peripheral fibrils of tubulin. It is absent in the centre. Therefore, the arrangement is called 9 + 0.
adjacent triplet fibrils are connected by C-A proteinaceous linkers.
From the hub, nine proteinaceous strands are developed towards the peripheral triplet fibrils. These strands are called radial spokes.
cartwheel appearance
Due to the presence of radial spokes and peripheral fibrils, the centriole gives a cartwheel appearance.
massules or pericentriolar satellites.
On the outside of the centriole are present dense, amorphous, protoplasmic plaques in one or more series. They are called
massules or pericentriolar satellites.
Their position is change-able with different states of the cell. Massules act as a microtubule organizing center or MTOC or
Microtubule generator or MTG

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