contribute 0.4% of the body's total mass, consists of 14 Elements. Aluminum (Al), boron (B), chromium (Cr), cobalt (Co), copper (Cu), fluorine (F), iodine (I), manganese (Mn), molybdenum (Mo), selenium (Se) silicon (Si), tin (Sn), vanadium (V), and zinc (Zn). 1. Nitrogenous Base, contain atoms of C,H,O and N, The four bases are adenine(A), thymine(T), cytosine(C), and guanine(G). Adenine and guanine are larger, double ring bases called Purines. Thymine and cytosine are smaller, sing ring bases call Pyrimidines.
2. Pentose Sugar, a five carbon sugar called deoxyribose attaches to each base in the DNA.
3. Phosphate group, phosphate groups (PO43-) alternate with the pentose sugars to form the "backbone" of a DNA strand, the bases project inward from the backbone chain.
3rd EditionOctave Levenspiel 2nd EditionLawrence S. Brown, Thomas A. Holme 6th EditionJanice Gorzynski Smith 9th EditionJohn E. McMurry