Deoxyribonucleic acid (DNA) is a molecule that encodes the genetic instructions used in the development and functioning of all known living organisms and many viruses. (Wikipedia)
This model is more similar to the actual structure of DNA which is helical. The spacing between backbones is also accurate in depicting the major and minor grooves.
This is my second submission mainly to test the features of the website. I figure this might be a fun object to sit on your desk or office.