Define the following terms: Nucleoside and Histones.

$S$ Statement: $DNA$ is inherited by organisms produced by parents.
$R$ Reason: $DNA$ acts as a gene.
$(a)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(b)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(c)$ $S$ is true and $R$ is false.
$(d)$ $S$ is false and $R$ is true.
$(e)$ Both $S$ and $R$ are false.

What does $Z$ represent in the given figure?

What is the distance between two consecutive base pairs in the structure of $DNA$ (in $nm$)?

In a $DNA$ fragment containing $6$ adenine nitrogen bases,what is the number of thymine nitrogen bases?

In $DNA$,the complementary bases are,