Penicillin is a small molecule that does not induce immune response. However, penicillin binds to serum proteins that induces an allergic reaction. Penicillin is therefore ()
A. an antigen
B. a hapten
C. an immunogen
D. both an antigen and a hapten
E. both an antigen and an immunogen
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What kind of Ig can pass placenta ()
A. IgG
B. IgA
C. IgM
D. IgD
E. IgE
According to what can Ig be divided into 5 classes ()
A. H and L chains are all different
B. V regions are different
C. L chains are different
D. H chains are different
E. CL
B cells can recognize Ag specifically, because they have ()
A. IgG
B. IgA
C. IgM
D. IgD
E. mIgM
What kind of cells can produce IgE ()?
A. DC
B cell
C. T cell
D. NK
E. Macrophage
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