ATI RN
Immune System Multiple Choice Questions and Answers Questions
Question 1 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 2 of 5
Which of the following is an effect of interleukin-2?
Correct Answer: A
Rationale: Interleukin-2, from helper T cells, promotes T cell proliferation, not mast cell histamine release, APC stimulation, or macrophage phagocytosis.
Question 3 of 5
Which of the following options best describes an opsonising agent?
Correct Answer: C
Rationale: C3b coats pathogens to enhance phagocytosis (opsonization), while antibodies also opsonize, but surfactants do not; C3b is the most specific example here.
Question 4 of 5
What is the major structural difference between B cell antigen receptor (BCRs) and secreted antibody?
Correct Answer: B
Rationale: BCRs have a transmembrane tail, while secreted antibodies lack it, retaining two binding sites.
Question 5 of 5
The following statement correctly describes a common feature of T & B cell development:
Correct Answer: B
Rationale: Both T and B cells rearrange receptor genes stepwise for diversity, not multiple specificities or abundant self-reactivity.