21. The Immune System
Review of Adaptive Immunity
Multiple Choice
Multiple ChoiceIn opsonization with IgG, why would it be important that IgG react with the antigen BEFORE a phagocytic cell recognizes the antibody molecule?
A
If the IgG is bound to the phagocyte before opsonization, it would most likely be ingested by the phagocyte before it could bind to a pathogen.
B
Binding of IgG by phagocytes would block the antigen binding sites on the IgG molecules, preventing them from binding to the microbes.
C
Binding of IgG by phagocytes changes the conformation of the antibody’s antigen binding site making it less effective at binding the correct foreign antigen.
D
Binding of an antibody by phagocytes results in immediate release of damaging hydrolytic enzymes to the outside of the cell which would destroy all remaining antibodies.
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