1 In biology, double helix is a term used to describe the structure of DNA. A DNA double helix consists of two spiral chains of deoxyribonucleic acid. The shape is similar to that of spiral staircase. DNA is a nucleic acid composed of nitrogenous bases (adenine, cytosine, guanine and thymine), a five-carbon sugar (deoxyribose), and phosphate molecules.
PA Power & Light (PP&L)------------------------------ 800-342-5775. UGI Utilities, Inc. (Gas)----------------------------------- 717-270-2545. Verizon (telephone)-------------------------------------- 800-483-4600. South Hanover Township Historical Society--- 717-566-8929.
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