DNA - RNA The small DNA-RNA model shows the double helix and how the molecules split at the centre of the base pairs. Items: • 28 coloured tubes (Guanine red, Cytosine green, Thymine blue, Adenine grey) • 12 white two prong centre, which represents the hydrogen bond between the base pairs • 28 black trigonal atom centres which represent sugar • 25 red two prong atom centres, which represent phosphate groups • 50 yellow tubes that link the phosphate groups to the sugar rings • Wooden base with support rod are included in the kit Height 50 cm.