Final answer:
In antibody-antigen interactions, covalent bonds are not typically involved; instead, these interactions are characterized by weaker forces like hydrogen bonds, ionic bonds, and hydrophobic interactions.
Step-by-step explanation:
The type of bond not usually found in an antibody-antigen interaction is a covalent bond. In such interactions, the binding typically involves weaker forces such as hydrogen bonds, ionic bonds, and hydrophobic interactions.
Covalent bonds, which involve the sharing of electron pairs between atoms, are much stronger and are not typically formed or broken during the normal antibody-antigen binding process. In antibody-antigen interactions, covalent bonds are not typically involved; instead, these interactions are characterized by weaker forces like hydrogen bonds, ionic bonds, and hydrophobic interactions.