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DNA stands for Deoxyribose Acid. A monomer unit of DNA is a . Each nucleotide has (<< type the number please) parts: a phosphate group, a deoxyribose , and a nitrogen . There are (<< type the number please) types of nitrogen bases: adenine, guanine, , and cytosine. Adenine and guanine are larger and therefore are . Thymine and cytosine are .