Antibodies can protect the host against invasion of pathogens through what methods?
A. Neutralization
B. Opsonization
C. Recruiting complement proteins
D. Antibody-dependent cell-mediated cytotoxicity
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CD19 is expressed on what cells?
A. B-1 cells
B-2 cells
C. T cells
D. Regulatory B cells
Which of the following cytokine is releases from virus-infected cells soon after infection?
A. TGF-β
B. IL-10
C. IFN-α
D. IL-2
Which type of immunoglobulin can cross placenta?
A. IgD
B. IgE
C. IgG
D. IgM
At secondary immune responses, which kind of immunoglobulin has the highest concentration in serum?
A. IgD
B. IgE
C. IgG
D. IgM
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