Which of the following is called the first line of

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ATI RN Test Bank

Which of the following is called the first line of defense in the immune response?

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

Correct Answer: A

Rationale: Innate immunity is the first defense; acquired (B, D) follows.

Examples of granulocytes include all of the following except:

A. neutrophil B. monocyte C. basophil D. eosinophil

Correct Answer: B

Rationale: Monocytes are agranulocytes, not granulocytes, unlike neutrophils, basophils, and eosinophils.

All of the following cells are phagocytic except for

A. basophils B. neutrophils C. lymphocytes D. eosinophils

Correct Answer: C

Rationale: Neutrophils , eosinophils , and basophils phagocytose; lymphocytes do not.

Which class of molecules is the most antigenic?

A. polysaccharides B. lipids C. proteins D. carbohydrates

Correct Answer: C

Rationale: Proteins are highly antigenic due to complexity; lipids are weak.

One known function of the cells of the thymus is to

A. produce and secrete thymic hormones B. produce and secrete antibodies C. act as antigen-presenting cells D. produce and secrete interleukin-1

Correct Answer: A

Rationale: Thymic cells produce thymic hormones (e.g., thymosin) to mature T cells, not antibodies or IL-1.

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