The immunoglobulin class of an antibody molecule i

ATI RN

ATI RN Test Bank

The immunoglobulin class of an antibody molecule is determined by the

A. structure of the L chains B. structure of the variable region C. structure of the constant region of the H chains D. function of the molecule

Correct Answer: C

Rationale: The constant region of heavy chains defines Ig classes (e.g., IgG, IgM), not light chains.

Which of the following is a primary function of the spleen in the lymphatic system?

A. Production of lymph B. Filtration of lymphatic fluid C. Production of red blood cells D. Filtration of blood and removal of damaged blood cells

Correct Answer: D

Rationale: The spleen filters blood, removing damaged cells, not lymph.

Lymphatic vessels have specialized one-way valves to ensure the proper flow of lymph. What is the consequence of valve dysfunction in these vessels?

A. Increased lymph flow B. Decreased lymph flow C. Blood clot formation D. Increased red blood cell production

Correct Answer: B

Rationale: Valve dysfunction slows lymph flow, causing fluid buildup.

Secondary lymphatic organs serve as the site for:

A. antibody formation B. lymph formation C. lymphocytes to encounter and bind to antigens D. lymphocyte formation and maturation

Correct Answer: C

Rationale: Secondary organs (e.g., lymph nodes) are where lymphocytes meet antigens.

Once an infection has passed, plasma cells die due to

A. apoptosis B. NK cells C. phagocytosis D. interferon

Correct Answer: A

Rationale: Plasma cells undergo programmed cell death (apoptosis) post-infection.

$89/ 30 days

$150/ 90 days