ATI RN
Ricci Maternity and Pediatrics NCLEX Question Immunization Questions
Question 1 of 5
The membrane attack complex consists of five different complement proteins C5, C6, C7, C8, and C9. Which of the following subunits bind to the surface and provide a binding site for a subsequent component?
Correct Answer: B
Rationale: C5b binds to the target membrane, initiating MAC assembly with C6-C9.
Question 2 of 5
A cell expressing CD3pos, CD25 pos, is a:
Correct Answer: D
Rationale: CD3+CD25+ cells are typically regulatory T cells (Tregs), expressing FoxP3.
Question 3 of 5
Which of the following describes the hematopoietic centers in Gestation?
Correct Answer: A
Rationale: Hematopoiesis shifts from blood islands (yolk sac) to liver, then bone marrow during gestation.
Question 4 of 5
A 3-year-old boy presented with recurrent attacks of pneumonia and otitis media since the 1st birthday. Your diagnosis is X-linked agammaglobulinemia. Of the following, the MOST likely offending organism is
Correct Answer: D
Rationale: X-linked agammaglobulinemia (Bruton's) impairs antibody production, making encapsulated bacteria like Streptococcus pneumoniae a common cause of infections like pneumonia and otitis media.
Question 5 of 5
Severe eosinophilia, defined as an absolute eosinophil count (AEC) more than
Correct Answer: C
Rationale: Severe eosinophilia is clinically defined as an AEC >1,500 cells/μL, indicating significant eosinophil elevation.