Advertisements
Advertisements
Question
Explain the formation of a nucleosome.
Advertisements
Solution
Komberg proposed a model for the nucleosome, in which 2 molecules of the four histone proteins H2A, H2B, H3, and H4 are organized to form a unit of eight molecules called histone octamere.
The negatively charged DNA is wrapped around the positively charged histone octamere to form a structure called a nucleosome. A typical nucleosome contains 200 bp of DNA helix. The histone octameres are in close contact and DNA is coiled on the outside of the nucleosome.
Nucleosome
RELATED QUESTIONS
How are the following formed and involved in DNA packaging in a nucleus of a cell?
(ii) Nucleosome
(iii) Chromatin
The length of DNA can be calculated by ______.
The octamer of histone protein is made of ______.
Which one of the following histone molecule is NOT double in one nucleosome?
Whittaker placed prokaryotes in:
Plasmid has been used as vector because ______.
In the eukaryotic cell cycle, cell fusion experiments show that:
What is the function of histones in DNA packaging?
Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?
The non-condensed, light stained and transcriptionally active segments of chromosomes are called ______.
