Final answer:
Cross-reactivity is the term that refers to the behavior of an antibody binding to an antigen other than the one it was raised against.
Step-by-step explanation:
Cross-reactivity is the term that refers to the behavior of an antibody binding to an antigen other than the antigen that elicited its synthesis. Antibodies, which are produced by plasma cells after stimulation by an antigen, may exhibit cross-reactivity for the same or similar epitopes on different antigens. This can occur because different macromolecules can exhibit similar molecular identities and orientations in short regions called epitopes.