Answer:
1. Heavy chain is an antibody which consists only of two heavy chains and lacks the two light chains usually found in antibodies.
2. Light chain is the small polypeptide subunit of an antibody (immunoglobulin).
3. Variable region is the ends of the light and heavy chains
4. Constant region is determines the mechanism used to destroy antigen.
5. antigen binding site is the part of an antibody which recognizes an antigen, the antigen-binding site of an antibody.
6. disulfide bridge are formed by the oxidation of 2 thiol groups within Cys residues and in many extracellular proteins.
7. epitope is the specific piece of the antigen to which an antibody binds. The part of an antibody that binds to the epitope is called a paratope.