Spindle fibres attach on to

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(D) The correct answer is $D$. Small disc-shaped structures present on the surface of the centromeres are called kinetochores. These structures serve

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kinetochore of the chromosome

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(D) The correct answer is $D$. Small disc-shaped structures present on the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment for spindle fibres to the chromosomes,which are then moved into position at the centre of the cell during cell division. While the centromere is the primary constriction of the chromosome,the kinetochore is the specific protein complex where the microtubules of the spindle apparatus attach.

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