Now in biochemistry. The chemical bonds we have to really be familiar with are the intermolecular bonds. Because even though the intermolecular bonds aren't as strong as the intramolecular bonds are on a one to one basis because usually we have so many of these intermolecular bonds involved in any given reaction these intermolecular bonds end up playing a very important role in actually determining what the pathway of a reaction is and what the structure of a final molecule is. For example, in proteins and in DNA, it's the inter molecular bonds that basically allow that three dimensional structure to actually exist in the first place. And we'll see exactly what we mean by that in future lectures. So let's discuss two important types of inter molecular bonds that you should be familiar with in your study of biochemistry.