Question

Number of nucleosomes found in helical coil of 30 nm chromatin fibre is

• A. 6
• B. 10
• C. 12
• D. 15

Answer 1

The correct option is A 6

• Chromosomal DNA is packaged with the assistance of histones which are positively charged proteins and strongly adhere to negatively charged DNA thereby, forming complexes known as nucleosomes.
• Each bead of nucleosome has approximately 166 bp of DNA which is wound 1.65 times around histone octamer.
• The 10 nm fibre of nucleosomes is further coiled to form a 30 nm solenoid that has 6 nucleosomes per turn of the solenoid.

Thus, the correct answer is option A.