ATI RN
Pediatric Immunization Practice Questions Questions
Question 1 of 5
Which of the following clear Viral infected cells that doesn't exhibit MHC-1
Correct Answer: C
Rationale: NK cells target cells lacking MHC class I, a mechanism viruses use to evade CD8 T cells.
Question 2 of 5
Macrophages serve as antigen presenting cells and activate
Correct Answer: B
Rationale: Macrophages present antigens on MHC to activate T lymphocytes.
Question 3 of 5
The adaptive immune system develops from stem cells originating in the
Correct Answer: B
Rationale: Adaptive immunity arises from stem cells in the fetal liver and bone marrow.
Question 4 of 5
The deficiency of the complement component factor D and properdin lead to the recurrent bacterial infection. Which of the following pathway is affected in this condition?
Correct Answer: A
Rationale: Factor D and properdin are specific to the alternative pathway, and their deficiency impairs bacterial clearance.
Question 5 of 5
The interaction of which molecule on the membrane of cells with its ligand signals apoptosis?
Correct Answer: D
Rationale: Fas (CD95) binding to FasL triggers apoptosis, critical in immune regulation.