DNA is a molecule that has a variety of functions within a living organism, including telling the organism how to “look,” facilitating reproduction, and helping cells to make proteins.[23] A single strand of DNA is thousands of times thinner than a single strand of human hair.[23] Each strand of DNA contains 3 building blocks: a group of sugars, a group of phosphates, and a nitrogen base.[23] DNA is built like a twisting ladder, with sugars and phosphates forming the side rails and various chemical bases forming pairs of rungs.[23] The specific sequence of chemicals in a strand of DNA tells...