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Name the basic structural unit of chromatin, which is described by R.Kornberg?

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Name the basic structural unit of chromatin, which is described by R.Kornberg?

(a) Scaffold protein

(b) Solenoid

(c) 30nm fiber

(d) Nucleosome

This question was posed to me in a national level competition.

My query is from Eukaryotic Chromatin and Chromosomes topic in division Molecular Genetics of Life Sciences

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Correct choice is (d) Nucleosome

To explain I would say: Nucleosome is the first level of DNA packing structure which is composed of beads-on-a-string structure. R.Kornberg in 1974 described the basic structure of chromatin.

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