Developing T cells first express pre T cell recept

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ATI RN Test Bank

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.

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.

Which of the following immunity is long-lasting and sometimes life-long?

A. Innate immunity B. Acquired immunity C. Passive immunity D. Active immunity

Correct Answer: D

Rationale: Active immunity can be lifelong due to memory; passive is short-term.

Cell mediated immunity is carried out by while humoral immunity is mainly carried out by

A. B cells/T cells B. Epitopes/Antigens C. T cells/B cells D. Antibodies/Antigens

Correct Answer: C

Rationale: T cells mediate cellular immunity (e.g., killing infected cells), while B cells drive humoral immunity (antibody production).

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