Assertion : DNA is associated with proteins.
Reason : DNA binds around histone proteins that form a pool and the entire structure is called a nucleosome.

Options

A. If both the asseration and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and rreason are true but the reason not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If the assertion is false but reason is true

Answer

A

Explanation

(a) A chain of DNA has 140 basse pairs, make `1(3)/(4)` turns and twist around a histone octamer forming nucleosome. The core of nucleosome consists of 4 histones `H_(2)A,H_(2)B,H_(3)` and `H_(4)`.