ATI RN
Chapter 15 The Lymphatic System and Immunity Review Questions Questions
Question 1 of 5
Why has it been so difficult for researchers to develop effective antivirals for HIV?
Correct Answer: B
Rationale: HIV's rapid mutation rate hinders antiviral development, more than its replication strategy, T cell damage, or transmission mode.
Question 2 of 5
Complete the following sentence. The most common antibody isotype found in serum, with roles in opsonisation, complement activation and ADCC as well as neonatal immunity is.....
Correct Answer: C
Rationale: IgG, the most abundant in serum, performs opsonization, complement activation, ADCC, and crosses the placenta for neonatal immunity.
Question 3 of 5
Which of the statements below is true for costimulatory molecules?
Correct Answer: B
Rationale: Costimulatory molecules (e.g., B7-CD28) enhance T cell survival and expansion, not initial interaction or IL-2 reduction.
Question 4 of 5
All of the following are true concerning IgE molecules, EXCEPT which one?
Correct Answer: D
Rationale: IgE aids parasites , is rare , drives allergies , and releases histamine ; it doesn't cross placenta or fix complement .
Question 5 of 5
Which substances will not stimulate an immune response unless they are bound to a larger molecule?
Correct Answer: C
Rationale: Haptens need carriers to be immunogenic; antigens and viruses don't, miligen is fictitious.