ATI RN
Lymphatic System Multiple Choice Questions and Answers Questions
Question 1 of 5
Several subsets of innate lymphoid cells (ILCs) have been identified that share their patterns of cytokine production with the known subsets of T cells. The combined activity of related ILC and T cell subsets is effective in eradicating pathogenic infections because:
Correct Answer: B
Rationale: ILCs respond early, followed by specific T cells ; ILCs aid killing , don't solely activate B cells , or migrate to nodes .
Question 2 of 5
The experiment shown in Figure Q6.19 uses two strains of mice that differ in their MHC genes. Strain A is H-2^a and Strain B is H-2^b. Mice of each strain are infected with the virus LCMV, and T cells are isolated at day 8 post-infection. These T cells are mixed with target cells that express either H-2^a or H-2^b; in each case, the target cells are either uninfected or infected with LCMV. The explanation for the results of this experiment is:
Correct Answer: D
Rationale: T cells are MHC-restricted; strain A T cells recognize H-2^a ; both strains respond (A, B), H-2^b cells are infected .
Question 3 of 5
The body's innate defenses against infection include
Correct Answer: B
Rationale: Innate defenses are nonspecific and include physical barriers like dead skin cells and mucus, which prevent pathogen entry, unlike antibodies or memory cells (adaptive immunity).
Question 4 of 5
When a B cell first interacts with its particular antigen, the B cell
Correct Answer: C
Rationale: B cells, upon antigen binding, differentiate into plasma cells that produce antibodies, not dying, engulfing, or altering antigens.
Question 5 of 5
Where is the antigen-binding site of this antibody?
Correct Answer: A
Rationale: The antigen-binding site is at site A (assumed figure), located at the variable regions of the antibody's arms.