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.
Garrett County (gÉrÉt) is the westernmost county of the U.S. state of Maryland. As of the 2010 census, the population was 30,097, making it the third-least populous county in Maryland. Its county seat is Oakland. The county was named for John Work Garrett (1820â1884), president of the Baltimore and Ohio Railroad.