Which of the following statements about centrosomes and centrioles is incorrect?

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Centrosomes contain only one centriole surrounded by pericentriolar materials.

The two centrioles in a centrosome are positioned perpendicular to each other.

Centrioles are involved in the formation of the spindle apparatus during cell division in animal cells.

Each centriole is composed of nine peripheral ﬁbrils, each a triplet of tubulin protein.

answer is A.

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Detailed Solution

Centrosome is an organelle usually containing two cylindrical structures called centrioles. They are surrounded by amorphous pericentriolar materials. Both the centrioles in a centrosome lie perpendicular to each other in which each has an organisation like the cartwheel. They are 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. 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.

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