The centrosome is ..........

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(B) The $centrosome$ is a non-membrane-bound organelle that contains two cylindrical structures called $centrioles$.These $centrioles$ are composed of

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absent in amoebae,red algae,blue-green algae,conifers,and angiosperms,and is composed of peripheral triplets of microtubules.

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(B) The $centrosome$ is a non-membrane-bound organelle that contains two cylindrical structures called $centrioles$.These $centrioles$ are composed of nine peripheral triplets of microtubules arranged in a $9+0$ pattern.$Centrosomes$ are absent in higher plants like $angiosperms$ and $conifers$,as well as in some protists like $amoebae$ and certain algae (e.g.,$red$ $algae$,$blue-green$ $algae$).They play a primary role in the formation of the spindle apparatus during cell division,not a secondary one.Therefore,option $B$ is the most accurate description regarding its composition and distribution.

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