What are the structures called that give an a | vedclass

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(C) : Nucleosomes appear as 'beads-on-string' in the chromosome when viewed under an electron microscope.The beads in the 'beads-on-string' arrangemen

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Nucleosomes

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(C) : Nucleosomes appear as 'beads-on-string' in the chromosome when viewed under an electron microscope.The beads in the 'beads-on-string' arrangement are complexes of histones and $DNA$.The bead plus the connecting $DNA$ that leads to the next bead forms the nucleosome.Nucleosome is the fundamental unit of organization on which the higher-order packaging of chromatin is built.The bead of each nucleosome contains eight histone molecules in which two copies each of $H_2A, H_2B, H_3$ and $H_4$ are found.

What are the structures called that give an appearance as 'beads-on-string' in the chromosomes when viewed under an electron microscope?

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