ua at deoxyribonucleic acid is tiny molecule that exists in every cell of our bodies and contains the blueprint for how our bodies grow it looks like double helix ( sort of twisted ladderof pairs of nucleotide moleculesg uaninecytosineadenineand thymine these are represented by the letters gcaand dna is long moleculeit' microscopicbut if it were stretched outits billion base pairs would be meters longthis program is simple animation of dna