What are spindle microtubules composed of?

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(C) Spindle microtubules are primarily composed of the protein tubulin. Specifically,they consist of approximately $95-97\%$ tubulin protein and a sma

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$95-97\%$ tubulin and $3-5\% RNA$

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(C) Spindle microtubules are primarily composed of the protein tubulin. Specifically,they consist of approximately $95-97\%$ tubulin protein and a small amount of $3-5\% RNA$. These microtubules are essential for the formation of the spindle apparatus during cell division,which facilitates the movement and segregation of chromosomes.

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