AT
            & GC Base Pairs

A+T & G+C pairs have similar structures


The combination of a two-ring purine (A or G) and a single-ring pyrimidine (T or C) forms a base bair (
A+T or G+C ) with three co-planar rings.


The
A+T pair has two H-bonds versus the G+C pair with thre .



All text material © 2011 by Steven M. Carr