(A) The spindle fibers are composed of microtubules,which are primarily made of a protein called $tubulin$. These fibers are essential for the movemen

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(A) The spindle fibers are composed of microtubules,which are primarily made of a protein called $tubulin$. These fibers are essential for the movement of chromosomes during cell division (mitosis and meiosis). Therefore,spindle fibers are proteinaceous in nature.