In DNA, adenine is normally paired with thymine. In RNA, adenine may be paired with uracil, which is chemically related to thymine. Unlike DNA, however, RNA can take on a variety of shapes, so adenine and uracil aren't always paired.
The table below shows the non-backbone atoms for RNA adenine that can form hydrogen bonds. See RNA backbone and DNA backbone for the backbone atoms. DNA lacks the oxygen at atom 12, so the number for the other atoms are lower by one in DNA.
|RNA atom||DNA atom||element||acceptor||donor|