A Centrosome Is

A centrosome is

A) a cylindrical structure made up of nine triplets of microtubules.
B) a chromosomal region that connects sister chromatids during mitosis and attaches them to the spindle.
C) a protein structure that binds centromeres and mediates the attachment of chromosomes to the spindle.
D) the major microtubule-organizing center in animal cells.

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