All of the following are true concerning IgM antib

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ATI RN Test Bank

All of the following are true concerning IgM antibodies EXCEPT which one

A. they are glycoprotein B. they fix complement C. they mediate allergic reaction D. they occur on the surface of lymphocytes

Correct Answer: C

Rationale: IgM is a glycoprotein , fixes complement , and is on B-cells ; allergies are IgE-mediated.

Antibodies disappear very quickly in which immunity?

A. Active immunity B. Naturally induced immunity C. Passive immunity D. Autoimmune response

Correct Answer: C

Rationale: Passive immunity has short-lived antibodies; active (A, D) is longer-lasting.

The skin, body hair, cilia, eyelashes, the respiratory tract, and endothelia throughout the body serve as?

A. Cellular barriers B. Physical barrier C. Cytokine barriers D. Physiological barriers

Correct Answer: B

Rationale: These are physical barriers ; not cellular or cytokine .

An epitope is

A. a B-cell B. a hapten C. an antibody D. the antigen determinant site

Correct Answer: D

Rationale: An epitope is the specific part of an antigen recognized by antibodies or T cells, not a cell or antibody itself.

Which of the following is not a characteristic of inflammation?

A. inactivation of macrophages B. increased vascular permeability and edema C. vasodilation D. pain

Correct Answer: A

Rationale: Inflammation activates macrophages, not inactivates them; it includes permeability, vasodilation, and pain.

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