NEETZoologyMolecular Basis of Inheritance
Select the correct statement for the given figure.
Options
- AHistones are organised to form a unit of seven molecules called histone octamer.
- BThe negatively charged DNA is wrapped around the negatively charged histone octamer to form a structure called
- CA typical nucleosome contains 300 bp of DNA helix.
- DNucleosomes constitute the repeating unit of a structure in the nucleus called chromatin, thread-like stained(
Correct answer
D. Nucleosomes constitute the repeating unit of a structure in the nucleus called chromatin, thread-like stained(
Step-by-step solution
Histones are organised to form a unit of eight molecules called histone octamer. The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called nucleosome (Figure 5.4 a). A typical nucleosome contains 200 bp of DNA helix. Nucleosomes constitute the repeating unit of a structure in the nucleus called chromatin, thread-like stained (coloured) bodies seen in nucleus. The nucleosomes in chromatin are seen as ‘beads-on-string’ structure when viewed under electron microscop