NURS 6501 Advanced Pathophysiology
Actual Final Exam Official Practice Exam
Actual Exam 2026/2027 with Detailed
Rationales | Complete Exam-Style Questions |
Pass Guaranteed – A+ Graded
══════════════════════════════════════
SECTION 1: CELLULAR & MOLECULAR PATHOPHYSIOLOGY Q1 – Q10
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Question 1 of 50
A 58-year-old male with a 40-pack-year smoking history presents with progressive dyspnea
and a persistent cough productive of blood-tinged sputum. Chest CT reveals a 3.2 cm
spiculated mass in the right upper lobe with mediastinal lymphadenopathy. Biopsy confirms
poorly differentiated non-small cell lung carcinoma with KRAS G12C mutation. The
pathologist notes that this mutation results in constitutive activation of a signaling pathway
that drives uncontrolled cellular proliferation. Which intracellular signaling cascade is most
directly dysregulated by this oncogenic driver?
A. Janus kinase-signal transducer and activator of transcription (JAK-STAT) pathway
B. Phosphoinositide 3-kinase-protein kinase B (PI3K-Akt) pathway
C. Mitogen-activated protein kinase (MAPK/ERK) pathway ✓ CORRECT
D. Nuclear factor-kappa B (NF-κB) pathway
Correct Answer: C
Rationale: The KRAS G12C mutation locks KRAS in a constitutively active GTP-bound state,
leading to persistent downstream activation of the RAF-MEK-ERK cascade within the MAPK
pathway, which drives transcription of genes promoting cell cycle progression and survival.
While PI3K-Akt is also downstream of KRAS, the G12C mutation primarily and most potently
activates the MAPK/ERK axis, making this the principal oncogenic driver in this tumor type.
,On the exam, remember that KRAS, BRAF, and EGFR mutations all converge on MAPK
signaling in lung adenocarcinoma.
Question 2 of 50
A 42-year-old woman presents with recurrent episodes of bilateral hand swelling, arthralgias,
and a malar rash. Laboratory studies reveal positive ANA, anti-dsDNA antibodies, and low
complement levels. Her renal biopsy shows diffuse proliferative glomerulonephritis with
subendothelial immune complex deposits. The mechanism of tissue injury in this patient's
kidneys is best characterized by which type of hypersensitivity reaction?
A. Type I hypersensitivity mediated by IgE and mast cell degranulation
B. Type II hypersensitivity involving antibody-mediated cytotoxicity against basement
membrane antigens
C. Type III hypersensitivity driven by immune complex deposition and complement activation
✓ CORRECT
D. Type IV hypersensitivity mediated by cytotoxic T lymphocytes and delayed-type
inflammation
Correct Answer: C
Rationale: Systemic lupus erythematosus with lupus nephritis classically demonstrates type
III hypersensitivity, where circulating immune complexes containing anti-dsDNA antibodies
deposit in the glomerular subendothelial space, activating the classical complement pathway
and generating C5a-mediated neutrophil chemotaxis that produces the characteristic "wire
loop" lesions. Type II hypersensitivity would be more consistent with Goodpasture syndrome,
where antibodies directly target type IV collagen in the basement membrane. Recognizing the
subendothelial immune complex pattern is key to distinguishing lupus nephritis from other
glomerular diseases on biopsy.
Question 3 of 50
A 67-year-old male with type 2 diabetes mellitus and chronic kidney disease stage 3b
presents with a non-healing ulcer on the plantar surface of his left foot. The wound bed
appears pale with minimal granulation tissue, and peripheral pulses are diminished.
Histologic examination of the ulcer edge reveals abundant neutrophilic infiltrates, necrotic
debris, and sparse fibroblasts with disorganized collagen deposition. The impaired tissue
repair in this wound is most directly attributable to which pathophysiologic mechanism?
A. Excessive matrix metalloproteinase activity degrading newly synthesized extracellular
matrix
,B. Persistent hypoxia secondary to microvascular dysfunction and advanced glycation
end-product accumulation ✓ CORRECT
C. Deficiency in transforming growth factor-beta (TGF-β) signaling reducing fibroblast
recruitment
D. Impaired neutrophil extracellular trap formation preventing bacterial clearance
Correct Answer: B
Rationale: Diabetic foot ulcers characteristically exhibit impaired healing due to chronic
tissue hypoxia resulting from microangiopathy, endothelial dysfunction, and accumulation of
advanced glycation end-products that cross-link collagen and reduce its solubility, thereby
compromising the proliferative phase of wound healing. While MMP dysregulation occurs in
chronic wounds, the primary driver in diabetic ulcers is the hypoxic microenvironment that
limits fibroblast proliferation, angiogenesis, and collagen synthesis. The pale wound bed and
diminished pulses point directly to ischemia as the central pathophysiologic defect.
Question 4 of 50
A 35-year-old woman with a family history of breast cancer undergoes genetic testing and is
found to carry a pathogenic BRCA1 mutation. She asks her advanced practice provider to
explain how this mutation increases her cancer risk. The provider explains that BRCA1
normally functions in DNA double-strand break repair through which specific molecular
mechanism?
A. Direct reversal of UV-induced pyrimidine dimers via photolyase activity
B. Homologous recombination repair using the sister chromatid as a template ✓ CORRECT
C. Base excision repair of single-base lesions via glycosylase enzymes
D. Non-homologous end joining with direct ligation of broken DNA ends
Correct Answer: B
Rationale: BRCA1 is a tumor suppressor that coordinates the homologous recombination
pathway for repairing DNA double-strand breaks, functioning as a scaffold protein that
recruits RAD51 to single-stranded DNA at break sites to facilitate strand invasion and
accurate repair using the sister chromatid template. Loss of BRCA1 function forces cells to
rely on error-prone non-homologous end joining, leading to genomic instability and
carcinogenesis. The exam frequently tests the distinction between homologous
recombination (high-fidelity, S/G2 phase, BRCA-dependent) and non-homologous end joining
(error-prone, active throughout cell cycle, Ku70/80-dependent).
, Question 5 of 50
A 28-year-old male presents with sudden-onset severe abdominal pain, nausea, and vomiting.
CT scan reveals a segment of small bowel with thickened, edematous walls and
pneumatosis intestinalis. Exploratory laparotomy shows dusky, nonviable bowel.
Histopathology demonstrates coagulative necrosis with preservation of tissue architecture,
ghost outlines of cells, and minimal inflammatory infiltrate. Which cellular event most
directly precipitated this pattern of tissue injury?
A. Activation of caspase-3 initiating apoptotic cell death with cell shrinkage
B. Ischemia-induced ATP depletion causing loss of ion pump function and cellular swelling ✓
CORRECT
C. Lysosomal enzyme release triggering autophagic vacuole formation
D. Calcium influx activating phospholipase A2 and membrane lipid peroxidation
Correct Answer: B
Rationale: Coagulative necrosis, the hallmark of ischemic injury in most solid organs except
the brain, results from ATP depletion causing failure of the Na+/K+-ATPase pump, leading to
cellular swelling, organelle dysfunction, and denaturation of structural and enzymatic proteins
that preserves the ghost architecture of dead cells. Apoptosis would show cell shrinkage,
chromatin condensation, and apoptotic bodies without the inflammatory response seen here.
The key distinction on exams is that coagulative necrosis preserves tissue outlines due to
protein denaturation, whereas liquefactive necrosis (seen in brain infarcts and abscesses)
involves enzymatic digestion.
Question 6 of 50
A 55-year-old male with metastatic melanoma is started on pembrolizumab, a programmed
cell death protein 1 (PD-1) inhibitor. Four weeks later, he develops a pruritic maculopapular
rash covering 40% of his body surface area. Skin biopsy shows interface dermatitis with
lymphocytic infiltrates and basal layer vacuolar degeneration. This adverse effect is best
explained by disruption of which normal immunologic homeostatic mechanism?
A. Blockade of IL-17 signaling preventing neutrophil recruitment to epithelial surfaces
B. Loss of peripheral T cell tolerance through inhibition of PD-1/PD-L1 immune checkpoint
signaling ✓ CORRECT
C. Impaired regulatory T cell function reducing interleukin-10 production
D. Defective central tolerance allowing autoreactive T cell escape from the thymus
Actual Final Exam Official Practice Exam
Actual Exam 2026/2027 with Detailed
Rationales | Complete Exam-Style Questions |
Pass Guaranteed – A+ Graded
══════════════════════════════════════
SECTION 1: CELLULAR & MOLECULAR PATHOPHYSIOLOGY Q1 – Q10
══════════════════════════════════════
Question 1 of 50
A 58-year-old male with a 40-pack-year smoking history presents with progressive dyspnea
and a persistent cough productive of blood-tinged sputum. Chest CT reveals a 3.2 cm
spiculated mass in the right upper lobe with mediastinal lymphadenopathy. Biopsy confirms
poorly differentiated non-small cell lung carcinoma with KRAS G12C mutation. The
pathologist notes that this mutation results in constitutive activation of a signaling pathway
that drives uncontrolled cellular proliferation. Which intracellular signaling cascade is most
directly dysregulated by this oncogenic driver?
A. Janus kinase-signal transducer and activator of transcription (JAK-STAT) pathway
B. Phosphoinositide 3-kinase-protein kinase B (PI3K-Akt) pathway
C. Mitogen-activated protein kinase (MAPK/ERK) pathway ✓ CORRECT
D. Nuclear factor-kappa B (NF-κB) pathway
Correct Answer: C
Rationale: The KRAS G12C mutation locks KRAS in a constitutively active GTP-bound state,
leading to persistent downstream activation of the RAF-MEK-ERK cascade within the MAPK
pathway, which drives transcription of genes promoting cell cycle progression and survival.
While PI3K-Akt is also downstream of KRAS, the G12C mutation primarily and most potently
activates the MAPK/ERK axis, making this the principal oncogenic driver in this tumor type.
,On the exam, remember that KRAS, BRAF, and EGFR mutations all converge on MAPK
signaling in lung adenocarcinoma.
Question 2 of 50
A 42-year-old woman presents with recurrent episodes of bilateral hand swelling, arthralgias,
and a malar rash. Laboratory studies reveal positive ANA, anti-dsDNA antibodies, and low
complement levels. Her renal biopsy shows diffuse proliferative glomerulonephritis with
subendothelial immune complex deposits. The mechanism of tissue injury in this patient's
kidneys is best characterized by which type of hypersensitivity reaction?
A. Type I hypersensitivity mediated by IgE and mast cell degranulation
B. Type II hypersensitivity involving antibody-mediated cytotoxicity against basement
membrane antigens
C. Type III hypersensitivity driven by immune complex deposition and complement activation
✓ CORRECT
D. Type IV hypersensitivity mediated by cytotoxic T lymphocytes and delayed-type
inflammation
Correct Answer: C
Rationale: Systemic lupus erythematosus with lupus nephritis classically demonstrates type
III hypersensitivity, where circulating immune complexes containing anti-dsDNA antibodies
deposit in the glomerular subendothelial space, activating the classical complement pathway
and generating C5a-mediated neutrophil chemotaxis that produces the characteristic "wire
loop" lesions. Type II hypersensitivity would be more consistent with Goodpasture syndrome,
where antibodies directly target type IV collagen in the basement membrane. Recognizing the
subendothelial immune complex pattern is key to distinguishing lupus nephritis from other
glomerular diseases on biopsy.
Question 3 of 50
A 67-year-old male with type 2 diabetes mellitus and chronic kidney disease stage 3b
presents with a non-healing ulcer on the plantar surface of his left foot. The wound bed
appears pale with minimal granulation tissue, and peripheral pulses are diminished.
Histologic examination of the ulcer edge reveals abundant neutrophilic infiltrates, necrotic
debris, and sparse fibroblasts with disorganized collagen deposition. The impaired tissue
repair in this wound is most directly attributable to which pathophysiologic mechanism?
A. Excessive matrix metalloproteinase activity degrading newly synthesized extracellular
matrix
,B. Persistent hypoxia secondary to microvascular dysfunction and advanced glycation
end-product accumulation ✓ CORRECT
C. Deficiency in transforming growth factor-beta (TGF-β) signaling reducing fibroblast
recruitment
D. Impaired neutrophil extracellular trap formation preventing bacterial clearance
Correct Answer: B
Rationale: Diabetic foot ulcers characteristically exhibit impaired healing due to chronic
tissue hypoxia resulting from microangiopathy, endothelial dysfunction, and accumulation of
advanced glycation end-products that cross-link collagen and reduce its solubility, thereby
compromising the proliferative phase of wound healing. While MMP dysregulation occurs in
chronic wounds, the primary driver in diabetic ulcers is the hypoxic microenvironment that
limits fibroblast proliferation, angiogenesis, and collagen synthesis. The pale wound bed and
diminished pulses point directly to ischemia as the central pathophysiologic defect.
Question 4 of 50
A 35-year-old woman with a family history of breast cancer undergoes genetic testing and is
found to carry a pathogenic BRCA1 mutation. She asks her advanced practice provider to
explain how this mutation increases her cancer risk. The provider explains that BRCA1
normally functions in DNA double-strand break repair through which specific molecular
mechanism?
A. Direct reversal of UV-induced pyrimidine dimers via photolyase activity
B. Homologous recombination repair using the sister chromatid as a template ✓ CORRECT
C. Base excision repair of single-base lesions via glycosylase enzymes
D. Non-homologous end joining with direct ligation of broken DNA ends
Correct Answer: B
Rationale: BRCA1 is a tumor suppressor that coordinates the homologous recombination
pathway for repairing DNA double-strand breaks, functioning as a scaffold protein that
recruits RAD51 to single-stranded DNA at break sites to facilitate strand invasion and
accurate repair using the sister chromatid template. Loss of BRCA1 function forces cells to
rely on error-prone non-homologous end joining, leading to genomic instability and
carcinogenesis. The exam frequently tests the distinction between homologous
recombination (high-fidelity, S/G2 phase, BRCA-dependent) and non-homologous end joining
(error-prone, active throughout cell cycle, Ku70/80-dependent).
, Question 5 of 50
A 28-year-old male presents with sudden-onset severe abdominal pain, nausea, and vomiting.
CT scan reveals a segment of small bowel with thickened, edematous walls and
pneumatosis intestinalis. Exploratory laparotomy shows dusky, nonviable bowel.
Histopathology demonstrates coagulative necrosis with preservation of tissue architecture,
ghost outlines of cells, and minimal inflammatory infiltrate. Which cellular event most
directly precipitated this pattern of tissue injury?
A. Activation of caspase-3 initiating apoptotic cell death with cell shrinkage
B. Ischemia-induced ATP depletion causing loss of ion pump function and cellular swelling ✓
CORRECT
C. Lysosomal enzyme release triggering autophagic vacuole formation
D. Calcium influx activating phospholipase A2 and membrane lipid peroxidation
Correct Answer: B
Rationale: Coagulative necrosis, the hallmark of ischemic injury in most solid organs except
the brain, results from ATP depletion causing failure of the Na+/K+-ATPase pump, leading to
cellular swelling, organelle dysfunction, and denaturation of structural and enzymatic proteins
that preserves the ghost architecture of dead cells. Apoptosis would show cell shrinkage,
chromatin condensation, and apoptotic bodies without the inflammatory response seen here.
The key distinction on exams is that coagulative necrosis preserves tissue outlines due to
protein denaturation, whereas liquefactive necrosis (seen in brain infarcts and abscesses)
involves enzymatic digestion.
Question 6 of 50
A 55-year-old male with metastatic melanoma is started on pembrolizumab, a programmed
cell death protein 1 (PD-1) inhibitor. Four weeks later, he develops a pruritic maculopapular
rash covering 40% of his body surface area. Skin biopsy shows interface dermatitis with
lymphocytic infiltrates and basal layer vacuolar degeneration. This adverse effect is best
explained by disruption of which normal immunologic homeostatic mechanism?
A. Blockade of IL-17 signaling preventing neutrophil recruitment to epithelial surfaces
B. Loss of peripheral T cell tolerance through inhibition of PD-1/PD-L1 immune checkpoint
signaling ✓ CORRECT
C. Impaired regulatory T cell function reducing interleukin-10 production
D. Defective central tolerance allowing autoreactive T cell escape from the thymus
