$RNA$ is a polymer of

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

If the distance between two consecutive base pairs is $0.34 \, nm$ and the total number of base pairs of a $DNA$ double helix in a typical mammalian cell is $6.6 \times 10^{9} \, bp$,then the length of the $DNA$ is approximately:

In the structure of $DNA$,the length of one full turn is $.........$ and the number of nitrogen base pairs is $...........$.

The purine bases of $DNA$ are .....

The diameter of each nucleosome is about: