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 is a rural suburban town on the periphery of metropolitan Boston, located on an upper valley of the Charles River. There were a half dozen small farms in the town after 1669, the result of a determined effort to populate the colonial frontier.ccording to the United States Census Bureau, the town has a total area of 15.2 square miles (39 km 2), of which 14.8 square miles (38 km 2) is land and 0.3 square miles (0.78 km 2) (2.30%) is water.