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.
Hanover, PA. Online Offers. Hanover is a borough in York County, Pennsylvania, 19 miles (31 km) southwest of York and 54 miles (87 km) north-northwest of Baltimore, Maryland. The town is situated in a productive agricultural region. The population was 15,289 at the 2010 census. The borough is served by a 717 area code and the Zip Codes of 17331-34.