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  • What are those structures that appear as beads-on-string in the chromosomes when viewed under electron microscope?      <str

What are those structures that appear as beads-on-string in the chromosomes when viewed under electron microscope?

 

 

 

Option: 1

Genes


Option: 2

Nucleotides


Option: 3

Nucleosomes


Option: 4

Base pairs


Answers (1)

best_answer

A nucleosome is sub-microscopic sub-unit of chromatin which is formed by wrapping of DNA over a core of histone proteins. The term was coined by Oudet et. al, (1975). It is oblate structure with a length of 10 nm and a thickness of 5-5.7 nm. Its core is called nu-body. The latter is formed of four pairs of histone molecules

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Pankaj

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