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

Write a note on the chemical composition of nucleic acids.

Which of the following bases is present in $DNA$?

Which one is found in $ATP$ ribonucleotide?

What are the positions of $N$ atoms present in the pyrimidine ring of nucleic acids?

Given below are two statements:
Statement $I$: Cytosine and guanine are formed in equal quantities in $DNA$ hydrolysis.
Statement $II$: Adenine and uracil are formed in equal quantities in $RNA$ hydrolysis.
The correct answer is: