ATI RN
Immune System Questions Questions
Question 1 of 5
Vertebrate eyes are Single-lens eyes with
Correct Answer: D
Rationale: Vertebrate eyes have a single lens where light is focused by the cornea and lens, the lens shape adjusts for near and far vision, and photoreceptors in the retina detect light. All options are correct.
Question 2 of 5
The complement system can be activated by
Correct Answer: B
Rationale: Antigen-antibody complexes activate the complement system, enhancing pathogen destruction, not mediators, membranes, or T cells alone.
Question 3 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 4 of 5
Which of the following statements correctly describes the exogenous pathway of antigen processing?
Correct Answer: A
Rationale: The exogenous pathway processes extracellular antigens for MHCII, activating CD4+ T cells, not cytosolic (endogenous) or TAP/proteasome-dependent.
Question 5 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.