ATI RN
Chapter 15 The Lymphatic System and Immunity Review Questions Questions
Question 1 of 5
Choose the correct statement about lymph node functions:
Correct Answer: A
Rationale: Lymph nodes form and recirculate lymphocytes ; spleen filters blood , stores cells , and platelets form in bone marrow .
Question 2 of 5
What is the function of CD1 proteins?
Correct Answer: B
Rationale: CD1 presents lipids to T cells ; protein fragments are MHC roles, not activation or antibody production .
Question 3 of 5
What is the function of programmed death 1 (PD-1) on T cells?
Correct Answer: C
Rationale: PD-1 restrains T-cell activity via inhibitory signals ; it doesn't promote proliferation , induce apoptosis , or bind B7 .
Question 4 of 5
Where are B lymphocytes believed to mature in adult humans?
Correct Answer: B
Rationale: B lymphocytes mature in bone marrow in humans ; Bursa is in birds, compact bone is structural, liver is fetal only.
Question 5 of 5
The clonal selection theory was first proposed in the 1950s, decades before the molecular details of B and T lymphocyte development and lymphocyte antigen recognition responses were elucidated. Nonetheless, Burnet, who proposed this theory, correctly inferred several key aspects of adaptive immune responses. One key postulate that Burnet proposed was that:
Correct Answer: D
Rationale: Burnet's theory posits clonal selection where each B cell expresses one antibody type as a receptor ; other options are true but less central to his hypothesis.