ATI RN
Pediatric Immunization Practice Questions Questions
Question 1 of 5
How many binding sites there are between Complementarity Determining Regions (CDR) and an antigen on one Fab
Correct Answer: D
Rationale: Each Fab has one antigen-binding site, but with 3 CDRs per chain (light and heavy), there are 6 CDRs total contributing to binding.
Question 2 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 3 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 4 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.
Question 5 of 5
The complement system plays a key role in the host defense process. Which of the following components of this system is the most important in chemotaxis?
Correct Answer: D
Rationale: C5a is the most potent complement-derived chemoattractant for neutrophils.