What are the structures called that give an appearance as ‘beadsonstring’ in the chromosomes when viewed under electron microscope?
AIPMT 2011, Medium
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c
(c) : Nucleosomes appear as ‘beadsonstring’ in the chromosome when viewed under electron microscope. The beads in ‘beadsonstring’ arrangement are complexes of histones and $DNA$. The bead plus the connecting $DNA$ that leads to the next bead from 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.
(c) : Nucleosomes appear as ‘beadsonstring’ in the chromosome when viewed under electron microscope. The beads in ‘beadsonstring’ arrangement are complexes of histones and $DNA$. The bead plus the connecting $DNA$ that leads to the next bead from 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.
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