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.
Its North Sea coastline, including The Wash, forms one of the area's main highlights. The county capital is Norwich. Norfolk is the fifth largest county in England, with an area of 5,371 km 2 (2,074 sq mi) and a population of 816,500.The name 'Norfolk' is a portmanteau of the Old English North Folk, taken from the tribes of ancient Angles people who lived there.ts North Sea coastline, including The Wash, forms one of the area's main highlights. The county capital is Norwich. Norfolk is the fifth largest county in England, with an area of 5,371 km 2 (2,074 sq mi) and a population of 816,500.