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| DNA DNA, Double-Stranded | Deoxyribonucleic Acid | Z-DNA | A-DNA | B-DNA | C-DNA | Left-Handed DNA | Selfish DNA | ds-DNA | DNA, Left-Handed | DNA, Selfish | Left Handed DNA A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine). |