Osmosis video - DNA structure

The basic structure of DNA is a double helix, which consists of two long strands of DNA wrapped around each other. Each strand consists of many nucleotides, each consisting of a sugar and phosphate group, which form the sugar-phosphate backbone of DNA, and a nitrogenous base, which determines the identity of each nucleotide. The order of the bases (A, T, C, and G) on each strand determines the DNA sequence. DNA strands are held together by hydrogen bonds between the bases.