The order of percent of total immunoglobulin in se

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The order of percent of total immunoglobulin in serum is

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

Correct Answer: D

Rationale: Serum order is IgG (~80%), IgA, IgM, IgD, IgE ; not other sequences (A-C).

B Cells are activated by

A. Complement B. Antibody C. Interferon D. Antigen

Correct Answer: D

Rationale: Antigens bind to B cell receptors to activate them, unlike complement, antibodies, or interferon (which modulate responses).

Clonal selection occurs when antigen is encountered by:

A. Basophils B. Eosinophils C. Mast cells D. T-cells

Correct Answer: D

Rationale: Clonal selection involves T and B cells proliferating after antigen encounter, not innate cells like basophils.

AIDS is such a deadly disease because the AIDS virus attacks and destroys

A. CD4+ T cells B. B cells C. CD8+ T cells D. macrophages

Correct Answer: A

Rationale: HIV targets CD4+ T cells , crippling immunity; CD8+ and macrophages are less primary targets.

All of the following are part of our antigen specific defense mechanisms except:

A. acute inflammation B. lymphocytes C. antibody production D. macrophages

Correct Answer: A

Rationale: Inflammation is nonspecific; lymphocytes and antibodies are specific.

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