LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
DNA molecule. Molecular model of deoxyribonucleic acid (DNA). DNA is composed of two strands (green and pink) twisted into a double helix. Each strand consists of an outer sugar-phosphate backbone with cross-linking nucleotide bases (vertical lines). There are four different bases: guanine, cytosine, thymine and adenine. Guanine always pairs with cytosine and adenine always pairs with thymine. DNA contains sections, called genes, which encode the body's genetic information. Genes determine each cell's structure, function and behaviour.
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