In a hairpin model of $RNA$,which nitrogenous base is typically found at the loop end?

Histone occupies the major grooves of $DNA$ at an angle of

$S$ 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.

The heterochromatin part of chromosome is . . . . . . times more rich in $DNA$ than euchromatin.

If the nucleotide sequence of a probe is $3'-ATCAGC-5'$,which of the following strands will it hybridize with?

Which of the following is genetically inert and does not transcribe messenger $RNA$ for protein synthesis?