DNA molecular model kit, USA, 1986.
© Science Museum / Science & Society Picture Library
DNA (deoxyribonucleic acid) molecular model kit made by Science Teaching Aids, Wisconsin, USA. DNA, which is found in the nuclei of living cells, holds all the information necesary to reproduce life. DNA is made up of four different chemical units (A, C, G and T), strung together in chains. It is the sequence of these four chemical units that provides the code to make the proteins which control living proceses.