DNA,conceptual computer artwork. Molecular model of deoxyribonucleic acid (DNA),composed of two strands twisted into a double helix. Each strand consists of an outer sugar-phosphate backbone (containing silver spheres) with nucleotide bases attached (containing black spheres). There are four different bases: guanine,cytosine,thymine and adenine. DNA contains sections,called genes,which encode each cell's structure,function and behaviour. Atoms are represented as spheres and are colour coded: carbon (black),oxygen (blue),phosphorous (silver) and nitrogen (purple) |