DNA structure

The DNA structure can be thought of like a twisted ladder. This structure is described as a double-helix, as illustrated in the figure above. It is a nucleic acid, and all nucleic acids are made up of nucleotides.The DNA molecule is composed of materials called nucleotides, and each nucleotide is composed of three different components such as sugar, phosphate groups, and nitrogen bases. 

The basic building blocks of DNA are nucleotides, which are composed of a carbon-sugar group, a phosphate group, and a nitrogen base. The sugar and phosphate groups link the nucleotides together to form each strand of DNA. Adenine (A), Thymine (T), Guanine (G)  and Cytosine (C) are four types of nitrogen bases.

These 4 Nitrogenous bases pair together in the following way: A with T, and C with G. These base pairs are essential for the DNA’s double helix structure, which resembles a twisted ladder.

The order of the nitrogenous bases determines the genetic code or the DNA’s instructions.