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The DNA found in humans, animals, plants, and bacteria share the same structure – that of a double helix (see GMAC’s logo), as according to the Watson-Crick model. The DNA found in humans, animals, plants and bacteria are also made up of the same components – compounds called nucleotides. Four different types of nucleotides commonly denoted as A, T, C, and G, make up DNA. Like the way alphabets form words, the sequence by which A, T, C, and G appear in the DNA can be “read” to determine the characteristics of living things.