CROWN COPYRIGHT / HEALTH & SAFETY LABORATORY / SCIENCE PHOTO LIBRARY CROWN COPYRIGHT / HEALTH & SAFETY LABORATORY / SCIENCE PHOTO LIBRARY
DNA (deoxyribonucleic acid) strands, illustration. DNA is the genetic material that controls the growth and development of all living organisms. It takes the form of long molecular strands forming a double helix. The helical structure consists of two spiralling sugar phosphate strands joined by pairs of nucleotide bases (rods). It is the order along the strands of these nucleotides bases, of which there are four types, that forms the genetic code.
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