How many types of antibodies are present?

ATI RN

ATI RN Test Bank

A. 2 B. 5 C. 4 D. 6

Correct Answer: B

Rationale: Five antibody classes exist (IgG, IgA, IgM, IgD, IgE) ; not 2, 4, or 6.

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.

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.

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