ATI RN
Chapter 15 The Lymphatic System and Immunity Review Questions Questions
Question 1 of 5
From the options below, which pattern recognition receptor (PRR) gene family is expressed by innate immune cells?
Correct Answer: D
Rationale: Innate immune cells express NLRs (cytosolic), RLRs (viral RNA), and TLRs (surface/cytosolic), making all options correct.
Question 2 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 3 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 4 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.
Question 5 of 5
Which portion of antibody structure is occupied by variable chains?
Correct Answer: C
Rationale: Variable regions are at the upper (antigen-binding) end ; not lower or middle .