Dna rna kit orbit cochranes of oxford 0079 buy dna rna kit orbit showing the five bases in red green blue grey and white the sugar rings in black and the phosphate groups in red yellow tubes join the sugar and phosphate groups white pieces show the hydrogen bonding between the bases the separate pieces can be joined and unjoined allowing you to demonstrate the transcription of rna when assembled the height of the model is 50cm 20 inches cochranes of oxford dna rna kit orbit