What is the structure and features of a DNA molecule

A DNA molecule is shaped in a double helix. It is composed of two sugar-phosphate backbones, conjoined by what we call 'bases'. These nitrogen bases: adenine, guanine, cytosine and thymine, which form the 'code' of the DNA, form weak complementary hydrogen bonds with the bases attached to the opposite sugar phosphate backbone. Adenine is always bounded to its complementary thymine. (A=T) Guanine is always bound to its complementary base Cytosine. (C=G)