ATI RN
Immune System Questions Questions
Question 1 of 5
Which complement pathway becomes activated by spontaneous hydrolysis of C3?
Correct Answer: B
Rationale: The alternative pathway is triggered by spontaneous C3 hydrolysis on pathogen surfaces, unlike classical (antibody-driven) or lectin (sugar-binding) pathways.
Question 2 of 5
T cells that have a β T cell receptors:
Correct Answer: B
Rationale: αβ T cells (95% of T cells) express CD4 or CD8, require MHC, and drive adaptive immunity.
Question 3 of 5
Which DOES NOT provide long-term immunity?
Correct Answer: B
Rationale: Passive immunity is short-term, relying on transferred antibodies; active immunity (A, C) generates long-term memory.
Question 4 of 5
Type II hypersensitivity is due to:
Correct Answer: D
Rationale: Type II involves antibodies (IgG/IgM) against mismatched cells; not IgE , T cells , or pollen .
Question 5 of 5
Which of the following antibody is an important host defense against encapsulated bacteria?
Correct Answer: B
Rationale: IgG2 targets polysaccharides on encapsulated bacteria; others (A, C, D) are less specific.