What Are the Components of DNA?

By Staff WriterLast Updated Mar 27, 2020 9:02:04 AM ET

DNA is a long molecule composed of two chains of smaller molecules called nucleotides, each which contain a region of nitrogen called the nitrogenous base, a carbon-based sugar molecule called deoxyribose and a region of phosphorus called the phosphate group. There are four types of nitrogenous bases: adenine (abbreviated as A), thymine (abbreviated as T), guanine (abbreviated as G) and cytosine (abbreviated as C).