Deoxyribonucleic acid (DNA) is a self-replicating macromolecule that acts as a carrier of genetic information in all living organisms. It is located within the chromosomes, which are located within the nucleus one each cell of the body. DNA is composed of four nitrogen-containing bases known as adenine (A), thymine (T), cytosine (C), and guanine (G); deoxyribose sugar; and a phosphate group. Formed as a double helix, DNA consists the nitrogen-containing bases, paired and held together by hydrogen bonds, in the center, and the sugar-phosphates along the sides of the helix.
