Deoxyribonucleic acid, the genetic material in the nuclei of all cells. Chemically it is a polymer of deoxyribonucleotides; the purine bases adenine and guanine, and the pyrimidine bases thymidine and cytidine, linked to deoxyribose phosphate. The sugar-phosphates form a double-stranded helix, with the bases paired internally
Sunday, September 25, 2011
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