Which of the following conveys the longestlasting

ATI RN

ATI RN Test Bank

Which of the following conveys the longest-lasting immunity to an infectious agent?

A. Naturally acquired passive immunity B. Artificially acquired passive immunity C. Naturally acquired active immunity D. All of these

Correct Answer: C

Rationale: Natural active immunity is longest-lasting due to memory; passive (A, B) is temporary.

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.

Which type of T cell lyses cells that have been infected with viruses?

A. inducer T cells B. helper T cells C. cytotoxic T cells D. suppressor T cells

Correct Answer: C

Rationale: Cytotoxic T cells lyse infected cells; helper and suppressor have other roles.

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