Question

The length of DNA helix in a typical nucleosome is

• A. 200 bp
• B. 1000 bp
• C. $3.2 \times 10^6 $ bp
• D. $ 6.6 \times 10^9$ bp

Answer 1

The Correct Option is A

A nucleosome is the basic structural unit of chromatin, consisting of DNA wrapped around histone proteins.

The length of DNA in a nucleosome is ~146 base pairs (bp) tightly bound to the histone core, with an additional ~54 bp as linker DNA, totaling ~200 bp per nucleosome.

Answer 2

• Nucleosome core: ~146 bp wrapped around histone octamer.
• Linker DNA: ~54 bp between nucleosomes.
• Total: ~200 bp per nucleosome unit.

The correct answer is (A) 200 bp.