Which of the following is not present in nucleic acids?

Which of the following nitrogen bases,either of purine or pyrimidine,does $NOT$ contain an $-NH_2$ group attached to its ring?

In a nucleoside,a base is attached at the $1^{\prime}$ position of the sugar moiety. $A$ nucleotide is formed by linking a phosphoric acid unit to the sugar unit of a nucleoside. At which position of the sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide?

Hydrolysis of which of the following nucleic acids does not give an equal number of $A$ and $T$ or $G$ and $C$?
$(A)$ $m$-$RNA$
$(B)$ Single strand $DNA$
$(C)$ $r$-$RNA$
$(D)$ Double helix $DNA$

If one strand of $DNA$ has the sequence $ATCGTATG$,the sequence in the complementary strand would be

Which nitrogen atom of a purine base is bonded with the furanose sugar to form a nucleoside?