Using the Electronegativities we can predict whether a given bond will be non-polar, polar covalent, or ionic. The greater the difference in electronegativity the more polar the bond.
DNA is a polymer of nucleotides. Two polymers can join to form a double-stranded molecule (double helix) via complimentary base pairing. For more details go to the "DNA structure and function" board
What are Hydrogen Bond Accepter and Hydrogen Bond Donor?
Unit Hydrogen Bonding - featuring simple activities with surface tension that visually demonstrate the strength of hydrogen bonds, and how detergents work.