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 low-lying and predominantly rural county in eastern England, in the region known as East Anglia. It has county borders with Lincolnshire to the west, Cambridgeshire to the west and southwest, and with Suffolk to the south.Its North Sea coastline, including The Wash, forms one of the area's main highlights.ravellers from the north of England, the Midlands and the north-west can use the direct East Midlands Trains [15] service from Liverpool, Manchester, Sheffield, Nottingham, Grantham and Peterborough which runs from Ely to Norwich. Abellio Greater Anglia also operate an hourly train between Cambridge and Norwich.