Isotypes refer to variations in the

ATI RN

ATI RN Test Bank

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).

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.

Antibodies are

A. plasma cells B. B-lymphocytes C. T-lymphocytes D. gamma globulin proteins

Correct Answer: D

Rationale: Antibodies are gamma globulin proteins produced by plasma cells, not cells themselves.

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