Each strand of the double helix is held together by covalent bonds between deoxyribose sugar and phosphate groups (on the 3' and 5' carbons) (making up the backbone). The bases-purines or pyrimidines - (adenine, guanine, cytosine and thymine) are also bonded onto the deoxyribose sugar (on 1' carbon) covalently.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.
Oakland County, Michigan (MI) County population in 2014: 1,237,868 (95% urban, 5% rural); it was 1,194,156 in 2000. County owner-occupied with a mortgage or a loan houses and condos in 2010: 264,844. County owner-occupied free and clear houses and condos in 2010: 86,144.
PEOPLE OVERVIEW. The 2016 Alameda County, California, population is 1,638,220. There are 2,217 people per square mile (population density). The median age is 36.9. The US median is 37.4. 49.57% of people in Alameda County, California, are married.