11. The ability of an antigen to induce an immune response does not depend on the antigen’s

A. ability to enter the thyroid
B. degree of aggregation
C. dose
D. size

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12. The antibiotic penicillin is a small molecule that does not induce antibody formation. However, penicillin binds to serum proteins and forms a complex that in some people induces antibody formation resulting in an allergic reaction. Penicillin is therefore

A. an antigen
B. a hapten
C. an immunogen
D. both an antigen and a hapten

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