ATI RN
Lymphatic System Exam Questions Questions
Question 1 of 5
Clonal selection
Correct Answer: C
Rationale: Clonal selection is the antigen-driven proliferation of specific B and T cells, not involving NK cells, leukocytes, or complement.
Question 2 of 5
Which of the following statements is correct?
Correct Answer: C
Rationale: T cells (CD4+) recognize MHCII-antigen complexes and help B cells, unlike antigenic shift (viral reassortment), immature DCs (antigen uptake), or soluble proteins.
Question 3 of 5
Which of the following statements is characteristic of isotype switching?
Correct Answer: C
Rationale: Isotype switching in germinal centers, driven by CD40 and cytokines, is irreversible and not required for IgM.
Question 4 of 5
The biological action(s) of the cytokine IL-2 include
Correct Answer: D
Rationale: IL-2 promotes T cell expansion and NK cytotoxicity, but supports (not inhibits) Treg survival.
Question 5 of 5
Which immunoglobulin is the principal one found in secretions such as milk?
Correct Answer: A
Rationale: IgA dominates secretions like milk; IgD , IgE , and IgG are less prevalent there.