The genetically active area of a chromosome is called:

The length of $DNA$ in $E. coli$ is:

Assertion : In a $DNA$ molecule,$A-T$ rich parts melt before $G-C$ rich parts.
Reason : In between $A$ and $T$ there are three $H-$ bonds,whereas in between $G$ and $C$ there are two $H-$ bonds.

Which one of the following histones is not present in the core particle of the nucleosome?

$A$ genome is the

In the structure of $DNA$,which components are positioned opposite to each other,at an equal distance,and in opposite directions?