iGen3 02-09a

DNA Nucleos ides & Nucleot ides

    A nucleot ide is the combination of one or more phosphate groups with a nucleoside [a base plus a sugar]. In DNA, the four nucleotides combine a monophosphate with a deoxyribose sugar. These are generically written as dNMP. The base is attached to the 1'-C of the sugar through the 9'-N of the purine, or the 1'-N of the pyrimidines. The phosphate PO4 group is always to the 5'-C of the sugar

Figure © 2010 PJ Russell, iGenetics 3rd ed.; all text material © 2010 by Steven M. Carr