NR 507 | Final Exam Practice Page 1
, NR 507 Final&midterm Exam | Advanced Pathophysiology |
Chamberlain | 100 Q & A | 2026/2027
NR-507 MIDTERM EXAM
Advanced Pathophysiology
Chamberlain University
100-Question Original Practice Examination
2026/2027 Edition
1. An adult develops wheezing, urticaria, and hypotension minutes after a bee sting. Which
mechanism most directly initiates the reaction?
A) Allergen cross-linking of mast-cell-bound IgE
B) IgG deposition in renal capillaries
C) Cytotoxic T-cell activation after 48 hours
D) IgM destruction of circulating erythrocytes
Correct Answer: Allergen cross-linking of mast-cell-bound IgE
Rationale: Prior sensitization leaves allergen-specific IgE on mast cells. Re-exposure cross-links these receptors
and triggers mediator release, including histamine and leukotrienes. Immune-complex deposition is type III
rather than the immediate type I mechanism responsible for this presentation.
2. Several hours after receiving incompatible blood, a recipient develops hemoglobinuria and a
positive direct antiglobulin test. What mechanism best explains the injury?
A) Delayed T-cell recruitment to skin
B) IgE-mediated mast-cell degranulation
C) Antibody-mediated complement activation against erythrocyte antigens
D) Immune-complex trapping within synovium
Correct Answer: Antibody-mediated complement activation against erythrocyte antigens
NR 507 | Final Exam Practice Page 2
, Rationale: Antibodies recognizing transfused red-cell antigens activate complement and produce hemolysis, a
type II hypersensitivity process. A direct antiglobulin test supports antibody or complement coating of
erythrocytes. Type I allergy causes immediate mediator release but not this specific immune hemolysis.
3. After a streptococcal infection, a child develops edema, cola-colored urine, and low serum
C3. Which immunologic process is most consistent with these findings?
A) IgE cross-linking on airway mast cells
B) Immune-complex deposition activating complement in glomeruli
C) CD8-mediated destruction of pancreatic beta cells
D) Isolated loss of neutrophil adhesion
Correct Answer: Immune-complex deposition activating complement in glomeruli
Rationale: Postinfectious glomerulonephritis commonly involves immune complexes and complement
activation within the glomerulus. Complement consumption can lower C3. The process differs from direct
antibody binding to blood-cell surfaces and from immediate IgE-mediated hypersensitivity.
4. A nickel-containing watch produces itchy, localized dermatitis two days after skin contact.
Which response drives the eruption?
A) Circulating IgE and immediate histamine release
B) Immune complexes lodged in glomerular capillaries
C) Autoantibodies against erythrocyte membranes
D) Sensitized T lymphocytes and macrophage recruitment
Correct Answer: Sensitized T lymphocytes and macrophage recruitment
Rationale: Allergic contact dermatitis is a delayed type IV hypersensitivity reaction mediated by antigen-
specific T cells and inflammatory cytokines. Its typical onset is delayed by one to several days. An IgE-mediated
response would usually develop within minutes of exposure.
5. A person with untreated HIV develops recurrent opportunistic infections. Which cellular
change is most responsible?
A) Selective proliferation of erythrocytes
B) Excessive production of functional neutrophils
NR 507 | Final Exam Practice Page 3
, C) Progressive depletion and dysfunction of CD4 helper T cells
D) Permanent activation of platelet aggregation
Correct Answer: Progressive depletion and dysfunction of CD4 helper T cells
Rationale: HIV targets cells expressing CD4, especially helper T lymphocytes, gradually compromising both cell-
mediated and coordinated humoral immunity. Platelet activation does not account for the broad susceptibility
to opportunistic infections. The degree of CD4 depletion strongly tracks immune vulnerability.
6. During evaluation of recurrent bacterial sinusitis, testing shows very low immunoglobulins
despite a near-normal T-cell count. Which defense is primarily impaired?
A) Renal bicarbonate reclamation
B) Antibody-mediated opsonization and neutralization
C) Platelet adhesion at damaged vessels
D) Alveolar surfactant synthesis
Correct Answer: Antibody-mediated opsonization and neutralization
Rationale: Antibodies neutralize pathogens and facilitate phagocytosis through opsonization and complement
engagement. Marked hypogammaglobulinemia especially predisposes to recurrent infections with encapsulated
bacteria. Normal T-cell numbers do not replace adequate functional antibody production.
7. A newborn has recurrent deep bacterial infections and delayed separation of the umbilical
cord. A defect in which process is most likely?
A) Antigen-specific memory B-cell formation
B) Erythrocyte hemoglobin assembly
C) Leukocyte adhesion and migration into infected tissue
D) Immunoglobulin class switching alone
Correct Answer: Leukocyte adhesion and migration into infected tissue
Rationale: Leukocyte adhesion deficiency limits neutrophil exit from blood into infected tissues, producing
recurrent infections with poor pus formation and delayed cord separation. A pure antibody class-switching
defect would not specifically explain the distinctive leukocyte migration finding.
NR 507 | Final Exam Practice Page 4
, NR 507 Final&midterm Exam | Advanced Pathophysiology |
Chamberlain | 100 Q & A | 2026/2027
NR-507 MIDTERM EXAM
Advanced Pathophysiology
Chamberlain University
100-Question Original Practice Examination
2026/2027 Edition
1. An adult develops wheezing, urticaria, and hypotension minutes after a bee sting. Which
mechanism most directly initiates the reaction?
A) Allergen cross-linking of mast-cell-bound IgE
B) IgG deposition in renal capillaries
C) Cytotoxic T-cell activation after 48 hours
D) IgM destruction of circulating erythrocytes
Correct Answer: Allergen cross-linking of mast-cell-bound IgE
Rationale: Prior sensitization leaves allergen-specific IgE on mast cells. Re-exposure cross-links these receptors
and triggers mediator release, including histamine and leukotrienes. Immune-complex deposition is type III
rather than the immediate type I mechanism responsible for this presentation.
2. Several hours after receiving incompatible blood, a recipient develops hemoglobinuria and a
positive direct antiglobulin test. What mechanism best explains the injury?
A) Delayed T-cell recruitment to skin
B) IgE-mediated mast-cell degranulation
C) Antibody-mediated complement activation against erythrocyte antigens
D) Immune-complex trapping within synovium
Correct Answer: Antibody-mediated complement activation against erythrocyte antigens
NR 507 | Final Exam Practice Page 2
, Rationale: Antibodies recognizing transfused red-cell antigens activate complement and produce hemolysis, a
type II hypersensitivity process. A direct antiglobulin test supports antibody or complement coating of
erythrocytes. Type I allergy causes immediate mediator release but not this specific immune hemolysis.
3. After a streptococcal infection, a child develops edema, cola-colored urine, and low serum
C3. Which immunologic process is most consistent with these findings?
A) IgE cross-linking on airway mast cells
B) Immune-complex deposition activating complement in glomeruli
C) CD8-mediated destruction of pancreatic beta cells
D) Isolated loss of neutrophil adhesion
Correct Answer: Immune-complex deposition activating complement in glomeruli
Rationale: Postinfectious glomerulonephritis commonly involves immune complexes and complement
activation within the glomerulus. Complement consumption can lower C3. The process differs from direct
antibody binding to blood-cell surfaces and from immediate IgE-mediated hypersensitivity.
4. A nickel-containing watch produces itchy, localized dermatitis two days after skin contact.
Which response drives the eruption?
A) Circulating IgE and immediate histamine release
B) Immune complexes lodged in glomerular capillaries
C) Autoantibodies against erythrocyte membranes
D) Sensitized T lymphocytes and macrophage recruitment
Correct Answer: Sensitized T lymphocytes and macrophage recruitment
Rationale: Allergic contact dermatitis is a delayed type IV hypersensitivity reaction mediated by antigen-
specific T cells and inflammatory cytokines. Its typical onset is delayed by one to several days. An IgE-mediated
response would usually develop within minutes of exposure.
5. A person with untreated HIV develops recurrent opportunistic infections. Which cellular
change is most responsible?
A) Selective proliferation of erythrocytes
B) Excessive production of functional neutrophils
NR 507 | Final Exam Practice Page 3
, C) Progressive depletion and dysfunction of CD4 helper T cells
D) Permanent activation of platelet aggregation
Correct Answer: Progressive depletion and dysfunction of CD4 helper T cells
Rationale: HIV targets cells expressing CD4, especially helper T lymphocytes, gradually compromising both cell-
mediated and coordinated humoral immunity. Platelet activation does not account for the broad susceptibility
to opportunistic infections. The degree of CD4 depletion strongly tracks immune vulnerability.
6. During evaluation of recurrent bacterial sinusitis, testing shows very low immunoglobulins
despite a near-normal T-cell count. Which defense is primarily impaired?
A) Renal bicarbonate reclamation
B) Antibody-mediated opsonization and neutralization
C) Platelet adhesion at damaged vessels
D) Alveolar surfactant synthesis
Correct Answer: Antibody-mediated opsonization and neutralization
Rationale: Antibodies neutralize pathogens and facilitate phagocytosis through opsonization and complement
engagement. Marked hypogammaglobulinemia especially predisposes to recurrent infections with encapsulated
bacteria. Normal T-cell numbers do not replace adequate functional antibody production.
7. A newborn has recurrent deep bacterial infections and delayed separation of the umbilical
cord. A defect in which process is most likely?
A) Antigen-specific memory B-cell formation
B) Erythrocyte hemoglobin assembly
C) Leukocyte adhesion and migration into infected tissue
D) Immunoglobulin class switching alone
Correct Answer: Leukocyte adhesion and migration into infected tissue
Rationale: Leukocyte adhesion deficiency limits neutrophil exit from blood into infected tissues, producing
recurrent infections with poor pus formation and delayed cord separation. A pure antibody class-switching
defect would not specifically explain the distinctive leukocyte migration finding.
NR 507 | Final Exam Practice Page 4
