NR507 Advanced Pathophysiology Midterm Exam
Complete 100-Question Guide Actual Exam 2026/2027 |
Complete Exam-Style Questions with Detailed Rationales
| Pass Guaranteed – A+ Graded
SECTION 1: Cellular Injury, Inflammation, and Genetics (15 Questions)
Q1: A 62-year-old patient with severe ischemic heart disease presents with cellular
injury on electron microscopy. The pathologist identifies amorphous flocculent
densities within the mitochondria. These densities represent which pathophysiologic
process?
A. Reversible cellular swelling due to ATP depletion
B. Irreversible marker of cell death indicating necrosis
C. Early apoptotic body formation
D. Lysosomal enzyme leakage into cytoplasm
Correct Answer: B
Rationale: Correct because mitochondrial amorphous flocculent densities are the
irreversible ultrastructural marker of cell death seen on electron microscopy,
distinguishing irreversible from reversible injury.
Q2: Following myocardial ischemia, the earliest reversible morphologic sign of cell injury
observed microscopically is:
A. Nuclear pyknosis
B. Karyorrhexis
,C. Cellular swelling
D. Apoptotic body formation
Correct Answer: C
Rationale: Correct because cellular swelling is the earliest reversible morphologic sign
of cell injury, caused by ATP depletion and failure of the Na⁺/K⁺-ATPase pump leading to
water influx.
Q3: The process by which a normal cell acquires the phenotypic and functional
characteristics of a cancer cell is termed:
A. Metaplasia
B. Dysplasia
C. Cell transformation
D. Hyperplasia
Correct Answer: C
Rationale: Correct because cell transformation is the specific process by which a
normal cell becomes a cancer cell through genetic and epigenetic alterations.
Q4: A patient with advanced pancreatic cancer develops severe wasting, anorexia, and
muscle atrophy. The primary mediator responsible for this cancer cachexia is:
A. Interleukin-6 (IL-6)
B. Tumor necrosis factor-alpha (TNF-α, cachectin)
C. Interferon-gamma (IFN-γ)
,D. Vascular endothelial growth factor (VEGF)
Correct Answer: B
Rationale: Correct because cancer cachexia is mediated primarily by TNF-α (cachectin),
which promotes catabolism, lipolysis, and proteolysis leading to wasting.
Q5: According to the "two-hit hypothesis" of carcinogenesis, both alleles of which gene
type must be inactivated for cancer to develop?
A. Proto-oncogenes
B. Tumor suppressor genes
C. DNA repair genes
D. Telomerase genes
Correct Answer: B
Rationale: Correct because the two-hit hypothesis applies to tumor suppressor genes
such as RB1 and TP53, where both alleles must be inactivated to lose growth regulatory
control.
Q6: A 45-year-old woman presents with joint pain, malar rash, and photosensitivity.
Laboratory testing reveals decreased serum C3 and C4 levels. Which hypersensitivity
mechanism underlies the pathophysiology of her systemic lupus erythematosus (SLE)?
A. Type I immediate hypersensitivity
B. Type II cytotoxic hypersensitivity
C. Type III immune complex hypersensitivity
, D. Type IV delayed T-cell mediated hypersensitivity
Correct Answer: C
Rationale: Correct because SLE is a prototype Type III immune complex disease where
antigen-antibody complexes deposit in tissues, activate complement, and consume C3
and C4.
Q7: Which laboratory finding is considered the most sensitive screening test for
systemic lupus erythematosus?
A. Anti-double-stranded DNA (anti-dsDNA)
B. Anti-Smith (anti-Sm) antibody
C. Antinuclear antibody (ANA)
D. Decreased complement C3
Correct Answer: C
Rationale: Correct because ANA is the most sensitive screening test for SLE, though it is
not specific; anti-dsDNA and anti-Smith are more specific but less sensitive.
Q8: The anti-Smith (anti-Sm) antibody in SLE is best characterized as:
A. Highly sensitive but not specific
B. Highly specific but not sensitive
C. Both highly sensitive and highly specific
D. Neither sensitive nor specific
Correct Answer: B
Complete 100-Question Guide Actual Exam 2026/2027 |
Complete Exam-Style Questions with Detailed Rationales
| Pass Guaranteed – A+ Graded
SECTION 1: Cellular Injury, Inflammation, and Genetics (15 Questions)
Q1: A 62-year-old patient with severe ischemic heart disease presents with cellular
injury on electron microscopy. The pathologist identifies amorphous flocculent
densities within the mitochondria. These densities represent which pathophysiologic
process?
A. Reversible cellular swelling due to ATP depletion
B. Irreversible marker of cell death indicating necrosis
C. Early apoptotic body formation
D. Lysosomal enzyme leakage into cytoplasm
Correct Answer: B
Rationale: Correct because mitochondrial amorphous flocculent densities are the
irreversible ultrastructural marker of cell death seen on electron microscopy,
distinguishing irreversible from reversible injury.
Q2: Following myocardial ischemia, the earliest reversible morphologic sign of cell injury
observed microscopically is:
A. Nuclear pyknosis
B. Karyorrhexis
,C. Cellular swelling
D. Apoptotic body formation
Correct Answer: C
Rationale: Correct because cellular swelling is the earliest reversible morphologic sign
of cell injury, caused by ATP depletion and failure of the Na⁺/K⁺-ATPase pump leading to
water influx.
Q3: The process by which a normal cell acquires the phenotypic and functional
characteristics of a cancer cell is termed:
A. Metaplasia
B. Dysplasia
C. Cell transformation
D. Hyperplasia
Correct Answer: C
Rationale: Correct because cell transformation is the specific process by which a
normal cell becomes a cancer cell through genetic and epigenetic alterations.
Q4: A patient with advanced pancreatic cancer develops severe wasting, anorexia, and
muscle atrophy. The primary mediator responsible for this cancer cachexia is:
A. Interleukin-6 (IL-6)
B. Tumor necrosis factor-alpha (TNF-α, cachectin)
C. Interferon-gamma (IFN-γ)
,D. Vascular endothelial growth factor (VEGF)
Correct Answer: B
Rationale: Correct because cancer cachexia is mediated primarily by TNF-α (cachectin),
which promotes catabolism, lipolysis, and proteolysis leading to wasting.
Q5: According to the "two-hit hypothesis" of carcinogenesis, both alleles of which gene
type must be inactivated for cancer to develop?
A. Proto-oncogenes
B. Tumor suppressor genes
C. DNA repair genes
D. Telomerase genes
Correct Answer: B
Rationale: Correct because the two-hit hypothesis applies to tumor suppressor genes
such as RB1 and TP53, where both alleles must be inactivated to lose growth regulatory
control.
Q6: A 45-year-old woman presents with joint pain, malar rash, and photosensitivity.
Laboratory testing reveals decreased serum C3 and C4 levels. Which hypersensitivity
mechanism underlies the pathophysiology of her systemic lupus erythematosus (SLE)?
A. Type I immediate hypersensitivity
B. Type II cytotoxic hypersensitivity
C. Type III immune complex hypersensitivity
, D. Type IV delayed T-cell mediated hypersensitivity
Correct Answer: C
Rationale: Correct because SLE is a prototype Type III immune complex disease where
antigen-antibody complexes deposit in tissues, activate complement, and consume C3
and C4.
Q7: Which laboratory finding is considered the most sensitive screening test for
systemic lupus erythematosus?
A. Anti-double-stranded DNA (anti-dsDNA)
B. Anti-Smith (anti-Sm) antibody
C. Antinuclear antibody (ANA)
D. Decreased complement C3
Correct Answer: C
Rationale: Correct because ANA is the most sensitive screening test for SLE, though it is
not specific; anti-dsDNA and anti-Smith are more specific but less sensitive.
Q8: The anti-Smith (anti-Sm) antibody in SLE is best characterized as:
A. Highly sensitive but not specific
B. Highly specific but not sensitive
C. Both highly sensitive and highly specific
D. Neither sensitive nor specific
Correct Answer: B
