Class 12th Biology 2017 Set2 Delhi Board Paper Solution

Question 10

Describe the structure of a nucleosome.

Answer

The negatively charged DNA is wrapped  around positiverly charged histone octamer to form a structure called nucleosome. A typical nucleosome consist of 200 bp of DNA helix. It consist four type of proteins which occurs in pairs :

H2A,  H2B,   H3   and   H4