Identify the given nitrogenous bases $P$ and $Q$.

If the amount of guanine in $DNA$ is $20 \%$,what is the amount of thymine (in $\%$)?

Wilkins' $X$-ray diffraction data of $DNA$ shows the diameter of the $DNA$ helix to be:

$S$ 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 are the properties of the two strands of a double-stranded $DNA$ molecule?

Provide the full forms of the following:
$1.$ $\text{DNA}$
$2.$ $\text{RNA}$
$3.$ $\text{hnRNA}$
$4.$ $\text{UTR}$