DNA Molecules

DNA stands for deoxyribonucleic acid.  It is an important molecules that carry genetic information for living organisms. The molecule forms double helix structure. 

Picture Source : Wikipedia

DNA is a polymer that made up of the smaller repeating units, called nucleotides. 

Some fun facts about DNA(from 10 Interesting DNA Facts

Fun, Useful, and Interesting Facts about DNA, By Anne Marie Helmenstine, Ph.D., About.com Guidez)

1. If you put all the DNA molecules in your body end to end, the DNA would reach from the Earth to the Sun and back over 600 times (100 trillion times six feet divided by 92 million miles).
2. A parent and child share 99.5% of the same DNA.

Knowledge about DNA  is widely used in the following fields : 

1. DNA profiling
2. Genetic engineering
3. History and anthopology
4. Bioinformatics
5. DNA nanotechnology.