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Biology
Genetics

What are molecular units that join to form DNA?

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January 12, 2009 9:54PM

DNA (deoxyribonucleic acid) is an organic polymer whose monomer is a nucleotide. A nucleotide is made up of a nitrogenous base (Adenine, Guanine, Cytosine, and Thymine in DNA, Uracil replaces Thymine in RNA), a pentose (5 carbons) sugar (deoxyribose in DNA and ribose in RNA), and a number of phosphate (PO4) groups ranging from 1 to 3 (1 in polymeric form, 2 or 3 when free in solution).