a polymer of four types of nucleotides, DNA, lipids, protein, Minerals, Each nucleotide has a deoxyribose sugar, three phosphate groups, and, hydrogen-base, sodium-base, Nitrogen-base, BUILDING BLOCKS OF DNA are , nucleotides, phosphate groups, Erwin Chargaff discoverd that the amounts of , A = T, A = G, A = C , T = C, Chargaff ’s second discovery, or rule, is that the DNA of different species differs in its proportions of , adenine only, guanine and adenine, Franklin discoverd that the diameter of DNA is, 2 nanometers, 20 nanometers, 0.2 nanometers, 2 meters, Franklin discovered that there is a repeating pattern along the DNA length every , 0.43 nanometers, 0.3 nanometers, 0.34 nanometers, 43 nanometers, Watson and Crick designed the DNA model with ............. chains, 2, 3, 1, 4.

s.D.NA

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