Question

Solenoid is a structure of

• A. Nucleosomal organisation with $10$nm thickness
• B. Condensed chromatin fibre with $30$nm diameter
• C. Highly condensed form of chromatid with $300$nm thickness
• D. Well organised chromatid with $700$nm thickness
• E. Well organised chromosome with $1400$nm thickness

Answer 1

Answer: (B)

Condensed chromatin fibre with $30$nm diameter

The solenoid structure of chromatin is a model for the structure of the 30 nm fibre. It is a secondary chromatin structure which helps to package eukaryotic DNA into the nucleus.

So, the correct answer is 'Condensed chromatin fibre with 30nm diameter'.