Flexi Says: One major importance of hydrogen bonds in biology is that they are responsible for many of the unique and important characteristics of water. Like carbon, water has a special role in living things. It is needed by all known forms of life. Water’s polar structure and hydrogen bonding make it a "universal solvent" that can dissolve many substances that organisms need, and water is necessary for many biochemical reactions. Hydrogen bonding also plays a key role in the function and replication of DNA. Hydrogen bonds between complementary bases hold together the two polynucleotide chains of DNA. Since these bonds are easily broken, the information in DNA can be easily copied to RNA for protein production or to new strands of DNA for replication.