View 1 --
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Looking down the axis of the double helix. Colors are the cpk colors (C - grey, H - white, O - red, N - blue, P - yellow/orange).
Looking at the double helix from the side.
Backbone (sugars and phosphates) is green and bases are white.
Looking down the axis again.
Backbone only. CPK colors. Find the phosphate at the end of each strand. Notice how the strands are anti-parallel.
"Zoomed" in to show details. Note the five-membered deoxyribose rings. Which end is the 5'? Which is the 3'?
An A-T base pair. The adenine (A) has bicyclic (two ring) structure. The thymine (T) is a single six-membered ring.
The two hydrogen bonds that hold an A-T base pair together are shown in light blue.
A G-C base pair. The guanine (G) has a bicyclic structure. The cytosine (C) is a single six-membered ring.
The three hydrogen bonds that hold a G-C base pair together are shown in light blue.
Copyright © 1998 by Frank R. Gorga, All rights reserved.