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In living organisms DNA does not usually exist as a single molecule, but ...... Levene suggested that DNAconsisted of a string of nucleotide units
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DNA is made up of three subunits: a deoxyribose 5 carbon sugar, a phosphorous group, and a nitrogenous base (adenine, thymine, guanine, cytosine). All in all, these are called nucleotides that wrap around in a double helix in order to form DNA.