Deoxyribonucleic Acid is the meaning of it. It is a nucleic acid that is the carrier of genetic information.
A nucleic acid is a polynucleotide. A polynucleotide consists of three simple units: a phosphate group, a 5 carbon sugar (pentose), and a nitrogenous base. The five carbon sugar is deoxyribose. Since a polynucleotide chain, the variation is provided by the nitrogenous bases.
There are four bases such as Adenine, Guanine, Cytosine, and Thymine.
Both adenine and guanine are purines which have a dual ring structure. Cytosine and thymine are pyrimidines which consist of a single ring structure.
The DNA molecule is a double helix, a spiral shaped ladder. The upright or backbone of the ladder is made of alternating pentose and phosphate groups held together by covalent bonds. Rungs or steps of the ladder consist of the bases. These bases are joined to the pentose sugars with covalent bonds. Adenine pairs with thymine using two hydrogen bonds and cytosine pairs with guanine using three hydrogen.
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