Which of the following is capable of self-replication?

One full turn of the $B-DNA$ helix is approximately .... (in $nm$)

$S$ 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.

In eukaryotic chromosomes,the association of $DNA$ with histone and non-histone proteins was reported by . . . . . . in $1974$.

Histones are rich in the basic amino acid ............... and ...............

Genes are chemically