Agglutination tests make use of the fact that
A) antibodies have two antigen-binding sites and will cause clumping when bound to antigen.
B) the presence of antibodies in a patient's serum will prevent viral infection of cells in culture.
C) a reporter enzyme can be bound to an antibody to provide a visual change with a positive test.
D) antibodies bound to antigen will precipitate in a gel matrix.
E) T cells will release interferon-gamma during certain infections.
Answer: A
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