The DNA double helix is held together by hydrogen bonds and the nucleotide bases Adenine, Guanine, Cytosine, or Thymine. Check out the source I provided. There's a great diagram of the double helix.Source(s): http://www.ba-education.demon.co.uk/for/...eport Abuse. Hydrogen bonds hold the two helices together to form a double helix. I also remember somethign called base stacking, which if i recall was hydrogen bonding of the same strand, which promoted the helical nature and enforced rigidity of the structure.
Norfolk, Nebraska. Norfolk (/ËnÉÉrfÉÉrk/ or /ËnÉÉrfoÊk/) is a city in Madison County, Nebraska, United States, 113 miles northwest of Omaha and 83 miles west of Sioux City at the intersection of U.S. Routes 81 and 275. The population was 24,210 at the 2010 census,[5] making it the ninth-largest city in Nebraska.
Norfolk (/ËnÉrfÊk/ NOR-fÉk, local /ËnÉfÊk/ NOF-uuk) is an independent city in the Commonwealth of Virginia, United States of America. At the 2010 census, the population was 242,803; in 2013, the population was estimated to be 246,392 making it the second-most populous city in Virginia, behind neighboring Virginia Beach.orfolk also has a federal courthouse for the United States District Court for the Eastern District of Virginia. The Walter E. Hoffman U.S. Courthouse in Norfolk has four judges, four magistrate judges, and two bankruptcy judges.