ATI RN
NCLEX Pediatric Immunization Questions Questions
Question 1 of 5
The highest white blood cells count is seen at
Correct Answer: B
Rationale: WBC counts peak at 12 hours of life (up to 20,000-30,000/μL) due to stress of birth, then decline over time.
Question 2 of 5
All the following are characteristic in properdin deficiency EXCEPT
Correct Answer: D
Rationale: Properdin deficiency impairs alternative complement pathway activity, reducing hemolytic complement activity, unlike the other features linked to it.
Question 3 of 5
B-cell antigen receptors can interact directly with antigen, whereas T-cell antigen receptors only recognize antigen when it is presented to them on the surface of another cell.
Correct Answer: A
Rationale: B-cell receptors (BCRs) bind free antigens directly, while T-cell receptors (TCRs) require antigen presentation via MHC molecules on another cell's surface.
Question 4 of 5
Which of the following components of the adaptive immune system secretes immunoglobulin (Ig)?
Correct Answer: A
Rationale: Plasma cells, which are activated B cells, secrete immunoglobulins (antibodies) as part of the adaptive immune response.
Question 5 of 5
Neutrophils
Correct Answer: D
Rationale: Neutrophils are primary phagocytes that engulf and kill bacteria using bactericidal mechanisms.