Question

Nucleosome is associated with ______ molecules of histones.

• A. Four
• B. Nine
• C. Two
• D. Eight

Answer 1

The Correct Option is D

Nucleosome Structure 

The fundamental repeating unit of chromatin in eukaryotic cells is the nucleosome. Its basic function is to package and order the DNA into a compact structure.

Composition:

• Each nucleosome consists of a complex of eight histone proteins. These eight proteins form the histone octamer.
• DNA is wrapped around this histone octamer.

Details:

• The eight histone proteins are:
  • Two H2A histones
  • Two H2B histones
  • Two H3 histones
  • Two H4 histones
• Approximately 146 base pairs of DNA are wrapped around the histone octamer.

The linker DNA, which is approximately 20-80 base pairs in length, connects adjacent nucleosomes.