Deoxynucleotides are the building blocks of DNA, which is essential for storing genetic information in living organisms. Each deoxynucleotide consists of three components: a phosphate group, a deoxyribose sugar, and a nitrogenous base. The four types of nitrogenous bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G). When deoxynucleotides link together through phosphodiester bonds, they form long chains, creating the structure of DNA. This structure is often described as a double helix, where two strands of deoxynucleotides twist around each other, allowing for the replication and transmission of genetic information during processes like cell division and DNA replication.