My DNA can be compared to an architect whose job is to draw up the grand design for living but it hands the work of building over to contractors - RNA or ribonucleic acid. In the form of molecules, all information is printed on the interlocking twin spirals of DNA. Messenger RNA snuggles up to DNA spirals and gets a blueprint of what is wanted. It then passes the word along to another form of RNA, transfer RNA. And the latter starts to work according to instructions - most likely building one of the hundreds of proteins in your body. It takes the 20-odd amino acids that proteins are made of, and strings them together like beads in a specified pattern. The result may be a pulsating muscle cell for your heart, a contractile leg muscle that permits to walk or whatever the DNA ordered.