Assertion : In a $DNA$ molecule, $A-T$ rich parts melt before $G-C$ rich parts.

Reason : In between $A$ and $T$ there are three $H-$ bond, whereas in between $G$ and $C$ there are two $H-$ bonds.

Genetically active area of chromosome is called

The given figure shows the structure of nucleosome with their parts labelled as $A,\, B$ and $C$. Identify $A,\,B$ and $C$

Explain the role of scientist :

$1.$ Friedrich Miescher $1869$

$2.$ Maurice wilkins and Rosalind Franklin

The $A/U$ and $G/U$ ratio in $RNA$ is