<P> Hydrogen bonds can occur between molecules ( intermolecular ) or within different parts of a single molecule ( intramolecular ) . Depending on the nature of the donor and acceptor atoms which constitute the bond , their geometry , and environment , the energy of a hydrogen bond can vary between 1 and 40 kcal / mol . This makes them somewhat stronger than a van der Waals interaction , and weaker than covalent or ionic bonds . This type of bond can occur in inorganic molecules such as water and in organic molecules like DNA and proteins . </P>
other than water what else has hydrogen bonds
inorganic molecules such as water organic molecules like DNA and proteins