DNA: is short for Deoxyribose Nucleic Acid. It is made up of unique codes that are part of the genetic make-up of every organism.

Cited: "DNA and Proteins are Key molecules of the cell Nucleus." DNA from the Beginning. DNAFTB.org. Updated 2006. Accessed 3 Dec 2006. http://www.dnaftb.org/dnaftb/15/concept/index.html