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 /ËnÉrfÉk/ is a county in East Anglia. It borders Lincolnshire to the west and north-west and Cambridgeshire to the west and southwest and Suffolk to the south.ver one-third of the population of Norwich died during a plague epidemic in 1579. By the 16th century Norwich had grown to become the second largest city in England, but in 1665 the Great Plague again killed around one third of the population. During the English Civil War Norfolk was largely Parliamentarian.