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प्रश्न
Explain the role of histones in forming a nucleosome.
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उत्तर
(i) Histones are positively charged basic proteins which are organised to form a unit of eight molecules called histone octamer.
(ii) Histones are rich in the basic amino acids residues lysines and arginines which carry positive charges in their side chains.
(iii) The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called nucleosome.
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संबंधित प्रश्न
How are the following formed and involved in DNA packaging in a nucleus of a cell?
(ii) Nucleosome
(iii) Chromatin
Draw a neat and labelled diagram of the Nucleosome.
A typical nucleosome "bead" is made up of ______.
The length of DNA can be calculated by ______.
Which one of the following histone molecule is NOT double in one nucleosome?
A stretch of euchromatin has 200 nucleosomes. How many bp will there be in the stretch and what would be the length of the typical euchromatin?
Whittaker placed prokaryotes in:
What is the function of histones in DNA packaging?
The most abundant prokaryotes helpful to human in making curd from milk and in the production of antibiotics are the ones categorised as ______ .
Statement I: In prokaryotes, the positively charged DNA is held with some negatively charged proteins in a region called nucleoid.
Statement II: In eukaryotes, the negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome.
In the light of the above statements, choose the correct answer from the options given below:
