Which of the following is the major immunoglobulin

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ATI RN Test Bank

Which of the following is the major immunoglobulin in human serum, accounting for 80% of the immunoglobulin pool?

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

Correct Answer: C

Rationale: IgG is the most abundant immunoglobulin in serum (~80%), key for systemic immunity.

Helper T cells and inducer T cells are also called ___________ cells because of the coreceptor they both have.

A. CD4+ T B. CD8+ T C. CD16+ T D. CD12+ T

Correct Answer: A

Rationale: Helper and inducer T cells are CD4+ ; CD8+ are cytotoxic.

MHC II molecules present

A. processed self-antigens from proteasomes B. processed foreign antigens from phagolysosomes C. antibodies D. T cell receptors

Correct Answer: B

Rationale: MHC II presents phagolysosomal antigens; proteasomes are MHC I.

The structure of a lymphatic vessel is most similar to that of

A. an artery B. an arteriole C. a vein D. a capillary

Correct Answer: C

Rationale: Lymphatic vessels resemble veins with thin walls and valves, unlike arteries or capillaries.

The antibodies involved in allergic reactions

A. are called allergens B. are secreted by mast cells C. belong to the IgE group D. are produced by T-lymphocytes

Correct Answer: C

Rationale: IgE antibodies trigger allergic responses by binding mast cells, not produced by T cells.

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