Test Bank For Middleton's Allergy 2-Volume Set, 10th Edition
Principles and Practice
Authors: A. Wesley Burks,Robyn E. O'Hehir,David H. Broide,Leonard B.
Bacharier,Gurjit K. Khurana Hershey,R. Stokes Peebles,Stephen R. Durham,Mübeccel
Akdis
, Middleton's Allergy: Principles and Practice, 10th Edition
Chapter 1 – Innate Immunity
Question 1
Which of the following best describes the primary function of pattern recognition
receptors (PRRs) in innate immunity?
A. Generation of antigen-specific antibodies B. Recognition of conserved pathogen-
associated molecular patterns (PAMPs) C. Rearrangement of T-cell receptor genes D.
Production of immunologic memory E. Somatic hypermutation of B cells
Correct Answer
B. Recognition of conserved pathogen-associated molecular patterns (PAMPs)
Explanation
PRRs are germline-encoded receptors expressed on innate immune cells that
recognize conserved molecular motifs known as pathogen-associated molecular
patterns (PAMPs) and damage-associated molecular patterns (DAMPs). Their
activation initiates inflammatory signaling pathways and early host defense.
Innate immunity acts rapidly and lacks antigen-specific memory. PRRs include Toll-
like receptors (TLRs), NOD-like receptors, RIG-I-like receptors, and C-type lectin
receptors.
Immunologic Pathway
PAMP recognition → PRR activation → NF-κB and IRF signaling → cytokine and
chemokine production → leukocyte recruitment and activation.
Why the Other Options Are Wrong
• A: Antibody generation is a function of adaptive B-cell immunity.
• C: T-cell receptor rearrangement occurs in adaptive immunity.
• D: Immunologic memory is characteristic of adaptive immunity.
• E: Somatic hypermutation occurs in germinal center B cells.
Question 2
, Toll-like receptor 4 (TLR4) most strongly recognizes which microbial component?
A. Double-stranded RNA B. Lipopolysaccharide (LPS) C. Flagellin D. Unmethylated
CpG DNA E. Peptidoglycan
Correct Answer
B. Lipopolysaccharide (LPS)
Explanation
TLR4 recognizes lipopolysaccharide from Gram-negative bacteria. Engagement of
TLR4 activates MyD88- and TRIF-dependent pathways leading to production of TNF-α,
IL-1, IL-6, and type I interferons.
Immunologic Pathway
LPS binding to TLR4/CD14/MD2 complex → NF-κB activation → proinflammatory
cytokine release.
Why the Other Options Are Wrong
• A: TLR3 recognizes double-stranded RNA.
• C: TLR5 recognizes flagellin.
• D: TLR9 recognizes unmethylated CpG DNA.
• E: Peptidoglycan is mainly recognized by TLR2.
Question 3
Which complement component is the major opsonin facilitating phagocytosis?
A. C1q B. C2a C. C3b D. C5a E. MAC
Correct Answer
C. C3b
Explanation
C3b covalently binds microbial surfaces and promotes phagocytosis by interacting
with complement receptors on neutrophils and macrophages.
Immunologic Pathway
, Complement activation → C3 cleavage → C3b deposition → enhanced phagocyte
recognition.
Clinical Reasoning
Deficiency of C3 predisposes patients to recurrent pyogenic infections because
opsonization is impaired.
Why the Other Options Are Wrong
• A: C1q initiates the classical pathway.
• B: C2a participates in C3 convertase formation.
• D: C5a is a potent chemoattractant.
• E: Membrane attack complex mediates lysis.
Question 4
Which transcription factor is centrally involved in inflammatory cytokine production
downstream of Toll-like receptor signaling?
A. FOXP3 B. NF-κB C. STAT6 D. GATA3 E. RAG1
Correct Answer
B. NF-κB
Explanation
NF-κB is activated downstream of PRRs and drives transcription of inflammatory
cytokines such as TNF-α, IL-1β, and IL-6.
Immunologic Pathway
TLR activation → MyD88 recruitment → IRAK/TRAF6 activation → IκB degradation → NF-
κB nuclear translocation.
Why the Other Options Are Wrong
• A: FOXP3 regulates Treg development.
• C: STAT6 is involved in IL-4 and IL-13 signaling.
• D: GATA3 promotes Th2 differentiation.
Principles and Practice
Authors: A. Wesley Burks,Robyn E. O'Hehir,David H. Broide,Leonard B.
Bacharier,Gurjit K. Khurana Hershey,R. Stokes Peebles,Stephen R. Durham,Mübeccel
Akdis
, Middleton's Allergy: Principles and Practice, 10th Edition
Chapter 1 – Innate Immunity
Question 1
Which of the following best describes the primary function of pattern recognition
receptors (PRRs) in innate immunity?
A. Generation of antigen-specific antibodies B. Recognition of conserved pathogen-
associated molecular patterns (PAMPs) C. Rearrangement of T-cell receptor genes D.
Production of immunologic memory E. Somatic hypermutation of B cells
Correct Answer
B. Recognition of conserved pathogen-associated molecular patterns (PAMPs)
Explanation
PRRs are germline-encoded receptors expressed on innate immune cells that
recognize conserved molecular motifs known as pathogen-associated molecular
patterns (PAMPs) and damage-associated molecular patterns (DAMPs). Their
activation initiates inflammatory signaling pathways and early host defense.
Innate immunity acts rapidly and lacks antigen-specific memory. PRRs include Toll-
like receptors (TLRs), NOD-like receptors, RIG-I-like receptors, and C-type lectin
receptors.
Immunologic Pathway
PAMP recognition → PRR activation → NF-κB and IRF signaling → cytokine and
chemokine production → leukocyte recruitment and activation.
Why the Other Options Are Wrong
• A: Antibody generation is a function of adaptive B-cell immunity.
• C: T-cell receptor rearrangement occurs in adaptive immunity.
• D: Immunologic memory is characteristic of adaptive immunity.
• E: Somatic hypermutation occurs in germinal center B cells.
Question 2
, Toll-like receptor 4 (TLR4) most strongly recognizes which microbial component?
A. Double-stranded RNA B. Lipopolysaccharide (LPS) C. Flagellin D. Unmethylated
CpG DNA E. Peptidoglycan
Correct Answer
B. Lipopolysaccharide (LPS)
Explanation
TLR4 recognizes lipopolysaccharide from Gram-negative bacteria. Engagement of
TLR4 activates MyD88- and TRIF-dependent pathways leading to production of TNF-α,
IL-1, IL-6, and type I interferons.
Immunologic Pathway
LPS binding to TLR4/CD14/MD2 complex → NF-κB activation → proinflammatory
cytokine release.
Why the Other Options Are Wrong
• A: TLR3 recognizes double-stranded RNA.
• C: TLR5 recognizes flagellin.
• D: TLR9 recognizes unmethylated CpG DNA.
• E: Peptidoglycan is mainly recognized by TLR2.
Question 3
Which complement component is the major opsonin facilitating phagocytosis?
A. C1q B. C2a C. C3b D. C5a E. MAC
Correct Answer
C. C3b
Explanation
C3b covalently binds microbial surfaces and promotes phagocytosis by interacting
with complement receptors on neutrophils and macrophages.
Immunologic Pathway
, Complement activation → C3 cleavage → C3b deposition → enhanced phagocyte
recognition.
Clinical Reasoning
Deficiency of C3 predisposes patients to recurrent pyogenic infections because
opsonization is impaired.
Why the Other Options Are Wrong
• A: C1q initiates the classical pathway.
• B: C2a participates in C3 convertase formation.
• D: C5a is a potent chemoattractant.
• E: Membrane attack complex mediates lysis.
Question 4
Which transcription factor is centrally involved in inflammatory cytokine production
downstream of Toll-like receptor signaling?
A. FOXP3 B. NF-κB C. STAT6 D. GATA3 E. RAG1
Correct Answer
B. NF-κB
Explanation
NF-κB is activated downstream of PRRs and drives transcription of inflammatory
cytokines such as TNF-α, IL-1β, and IL-6.
Immunologic Pathway
TLR activation → MyD88 recruitment → IRAK/TRAF6 activation → IκB degradation → NF-
κB nuclear translocation.
Why the Other Options Are Wrong
• A: FOXP3 regulates Treg development.
• C: STAT6 is involved in IL-4 and IL-13 signaling.
• D: GATA3 promotes Th2 differentiation.
