Three representations of DNA's double helical structure.
A is a spacefill model of DNA, where every atom is represented as a sphere. The two anti-parallel polynucleotide strands are colored differently to illustrate how they coil around each other. B is a cartoon model of DNA, where the sugar-phosphate backbones are represented as violet strands and the nitrogenous bases are represented as color-coded rings. C is another spacefill model, with the sugar-phosphate atoms colored violet and all nitrogenous base atoms colored green. The major and minor grooves, which wrap around the entire molecule, are apparent as the spaces between the sugar-phosphate backbones.
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