Final answer:
The statement is true - antigen-antibody binding can occur when an antibody combines with epitopes on two different cells.
Step-by-step explanation:
Antigen-antibody binding can occur when an antibody combines with epitopes on two different cells.
This statement is true. An antigen is a molecule that can stimulate an immune response, and an antibody is a protein produced by the immune system in response to an antigen. Antibodies have specific binding sites called epitopes, which can recognize and bind to antigens that have matching epitopes.
When an antibody binds to epitopes on two different cells, it can lead to the formation of antigen-antibody complexes. This binding is important in immune responses as it can neutralize pathogens, mark them for destruction, or activate other immune cells.