What are the four basic units of DNA?

The four basic units of DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).

DNA is made up of molecules called nucleotides, each consisting of a sugar, a phosphate group, and one of the four nitrogenous bases: adenine, thymine, cytosine, or guanine. These bases pair specifically (A with T and C with G) to form the double helix structure. The sequence of these bases encodes genetic information used by cells to build proteins and control life processes.

These four bases are essential for heredity, genetic variation, and the functioning of all living organisms. Learning about them helps us understand genetics, biology, and biotechnology.