B and T cells are produced by stem cells that are

ATI RN

ATI RN Test Bank

B and T cells are produced by stem cells that are formed in:

A. Bone marrow B. The liver C. The circulatory system D. The spleen

Correct Answer: A

Rationale: B and T cells originate in bone marrow ; liver is fetal, spleen is secondary.

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.

Isotypes refer to variations in the:

A. heavy chain constant region B. heavy chain variable region C. light chain constant region D. light chain variable region

Correct Answer: A

Rationale: Isotypes (e.g., IgG, IgM) differ in the heavy chain constant region, determining function, not variable regions (specificity).

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.

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