Which of the following is correct about $H$-bonding in $DNA$?

The pairs of bases in $DNA$ are held together by

The total number of correct statements regarding the nucleic acids is..............
$A$. $RNA$ is regarded as the reserve of genetic information.
$B$. $DNA$ molecule self-duplicates during cell division.
$C$. $DNA$ synthesizes proteins in the cell.
$D$. The message for the synthesis of particular proteins is present in $DNA$.
$E$. Identical $DNA$ strands are transferred to daughter cells.

The two strands in $DNA$ are not identical but are complementary. Explain.

The structure of the nitrogen-containing heterocyclic base given below represents:

Which of the following is a purine derivative?