$DNA$ contains a base that is not present in $RNA$. Identify it.

For a double strand $DNA$,one strand is given below:
$5'-A-G-T-C-A-C-G-T-A-A-G-T-C-3'$
The amount of energy required to split the double strand $DNA$ into two single strands is $.... \ kcal \ mol^{-1}$.
[Given: Average energy per $H$-bond for $A-T$ base pair $= 1.0 \ kcal \ mol^{-1}$,$G-C$ base pair $= 1.5 \ kcal \ mol^{-1}$. Ignore electrostatic repulsion between the phosphate groups.]

The difference between $DNA$ and $RNA$ is based on the presence or absence of a hydroxyl group at which carbon atom of the sugar molecule?

Out of the following isomeric forms of uracil,which one is present in $RNA$?

Write the structures of fragments produced on complete hydrolysis of $DNA$? How are they linked in $DNA$ molecule? Draw the diagram to show pairing of nucleotide bases in double helix of $DNA$?

The complementary bases in $DNA$ are .......