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.
Alameda County is the seventh most populous county in California, and has 14 incorporated cities and several unincorporated communities. The total population is estimated to be 1,510,271 as of April 2010, a 4.6% increase from April 2000. During the same time period, Californiaâs population rose 10%.