DNA is the information code cells use to tell them what to do. It is found tightly coiled in chromosomes within the nucleus.
Chromosomes
DNA has a ladder like shape. The sides of the ladder are made up of alternating phosphate and sugar molecules. The rungs of the ladder attach to the sugar molecules and are composed of 1 of 4 nitrogen bases (adenine, thymine, cytosine, guanine). Adenine always bonds with thymine and cytosine with guanine.
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