The term 'Nuclein' for the genetic material was used by

Purines found both in $DNA$ and $RNA$ are

Nucleosomes are bounded by

Which of the following is not correct

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.

If a length of $DNA$ has $45,000$ base pairs, how many complete turns will the $DNA$ molecule take?