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.
Population, Year of the First Census Taken: 853 residents in 1790 Population Trends: Population change for Hampton totaled 9,753 over 55 years, from 5,379 in 1960 to 15,132 in 2015. The largest decennial percent change was a 49 percent increase between 1960 and 1970. The 2015 Census estimate for Hampton was 15,132 residents, which ranked 18th among New Hampshire's incorporated cities and towns. Population Density and Land Area, 2015 (US Census Bureau): 1,099.7 persons per square mile of land area, the eighth highest among the cities and towns.