ATI RN
Immune System Multiple Choice Questions and Answers Questions
Question 1 of 5
The lymphatic trunk that drains the upper limb is the
Correct Answer: C
Rationale: The subclavian trunk drains the upper limb; bronchomediastinal drains the chest, intestinal the gut, and jugular the head/neck.
Question 2 of 5
Opsonization of pathogens by both antibodies and complement proteins (C3b) leads to uptake and destruction of the pathogen by phagocytic cells that express both Fc receptors and complement receptors. Which of the following in Figure Q2.16 is the most efficient form of dual opsonization of the pathogen by antibody and C3b to maximize phagocytosis?
Correct Answer: A
Rationale: Assuming Q2.16 shows options, dual opsonization with IgG and C3b maximizes phagocytosis via Fc and complement receptors.
Question 3 of 5
The cellular distribution of MHC class I versus MHC class II molecules is quite different, with MHC class II molecules generally expressed on a very limited set of cell types. This is because:
Correct Answer: B
Rationale: MHC II on APCs (macrophages, B cells) allows CD4 T-cell help ; CD8 killing or DC focus aren't the reason.
Question 4 of 5
Auxin hormones act as
Correct Answer: D
Rationale: Auxins promote seedling elongation, are transported downward (polar transport), and affect root elongation at lower concentrations. All options are correct.
Question 5 of 5
The two main functions of the lymphatic system are
Correct Answer: D
Rationale: The lymphatic system returns interstitial fluid to blood and combats infections via lymph nodes and organs, not coagulation or hormone production.