Question

In one nucleosome, which one of the following histone molecule is NOT double ?

• A. $H_{4}$
• B. $H_{3}$
• C. $H_{2}$
• D. $H_{1}$

Answer 1

Answer: (D)

$H_{1}$

Answer 2

Histones are of five types - $H_1, H_2A, H_2B, H_3$ and $H_4$. Four of them ($H_2A, H_2B, H_3$ and $H_4$) occur in pairs to produce histone octamer, called nu body or core of nucleosome. A fifth type of histone called $H_1$ is attached over the linker pair which is a single protein.