The number of oxygen atoms present in a nucleotide formed from a base that is present only in $RNA$ is ....

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.]

Which of the following statements is $NOT$ true for nucleic acids?

Which of the following contributes to the double helical structure of $DNA$?

The nucleic acid base having two possible binding sites is

If on a strand of $DNA$ the base sequence is $ATTGACGCAT$ then the sequence transcription on $RNA$ would be