-2 middle school students from Michigan
May 28, 2004
You may have heard of the "double helix" of DNA. Double helix refers to the shape of DNA, which is a ladder-like molecule that looks like the picture to the right. In DNA, two long strands (shown in yellow) wind around each other. These strands, the backbones of the ladder, are two long chains made of phosphate molecules.
The rungs of the ladder? Well, attached to each of these phosphates is the sugar that gives DNA its name, deoxyribose.