This is the DNA base pair of Adenine. It is a simple hexagon rather than the penta+hexagon of its mate Adenine. You are give the basic tour as well at the (I am soooo stupid realization) that DNA does not contrain simple ribose but look! there is a oxygen missing ie it has been Deoxyed compared to Ribose nucleaic acid ie it is Deoxyribonucealic acid. MP4 recording     MP3 recording -- -- Your browser does not support the audio element.