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 town in Norfolk County, Massachusetts, United States, with a population of 11,227 people at the 2010 census.Formerly known as North Wrentham, Norfolk broke away to become an independent town in 1870.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.