Which innate immune cell efficiently kills antibod

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Which innate immune cell efficiently kills antibody coated parasites?

A. Macrophages B. Eosinophils C. Neutrophils D. Basophils

Correct Answer: B

Rationale: Eosinophils target antibody-coated parasites (e.g., helminths) via degranulation, unlike macrophages, neutrophils, or basophils.

Developing T cells first express pre T cell receptors:

A. At the double positive T cell stage B. After negative selection C. When they are double negative thymocytes D. After positive selection

Correct Answer: C

Rationale: Pre-TCRs appear in double-negative thymocytes, before CD4/CD8 expression.

B-cells do which of the following?

A. Act as antigen-processing cells B. Respond to antigens by making antibodies C. Proliferate and differentiate into plasma cells D. All of the above

Correct Answer: D

Rationale: B-cells process antigens , produce antibodies , and become plasma cells , so all are true.

Agammaglobulinemia is an immunodeficiency disease due to a deficiency in:

A. B cells B. MHC C. IgE D. Cytokines

Correct Answer: A

Rationale: Agammaglobulinemia lacks B cells , impairing antibodies; not T cells or others (B, C, D).

Which of the following antibodies directly participate in the opsonization process?

A. IgM B. IgG C. IgA D. IgE

Correct Answer: B

Rationale: IgG opsonizes via Fc receptors; IgM aids complement, not direct.

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