ATI RN
Immune System Practice Questions Questions
Question 1 of 5
Which of the options below best completes the following statement: Perforin is a protein secreted by NK cells which.
Correct Answer: C
Rationale: Perforin forms pores in target cell membranes, allowing granzymes to enter and induce lysis, not related to C9 or MHC detection.
Question 2 of 5
The expression of γ:δ T cell receptor results in lymphocytes with 'innate like' features, an example of which is that these cells:
Correct Answer: C
Rationale: γδ T cells have innate-like effector roles (e.g., cytokine production), recognizing non-MHC ligands.
Question 3 of 5
Which of the following DOES NOT play a role in antigen presentation?
Correct Answer: C
Rationale: MHC I and II present antigens; MHC III includes complement genes, not presentation.
Question 4 of 5
Human immunodeficiency virus (HIV) binds specifically to which immune cell marker?
Correct Answer: D
Rationale: HIV targets CD4 on T-helper cells; not CD8 , MHC , or others (C, E).
Question 5 of 5
Which type of antibody is MOST effective in activating complement?
Correct Answer: D
Rationale: IgM is most effective due to pentameric structure; IgG3 is strong but less so.