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Question

Fill in the blanks with appropriate words.
In cell division, the spindle fibres are formed from ..........

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Solution

The spindle apparatus consists of spindle fibres, motor proteins, chromosomes, and, in some cells, structures called asters. In animal cells, spindle fibres are produced from cylindrical microtubules called centrioles.
Centrioles form asters and asters generate spindle fibres during the cell cycle.
So, the correct word is 'centriole'.

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