1
PATHOPHYSIOLOGY EXAM 1 & FINAL – QUESTIONS
AND ANSWERS WITH RATIONALES 2026 JUST
RELEASED VERSION
SECTION A: CELLULAR & MOLECULAR PATHOPHYSIOLOGY (Q1–
20)
Q1. Which event marks the point of NO RETURN in cell injury?
A. Mitochondrial swelling
B. ATP depletion
C. Plasma membrane disruption
D. Ribosomal detachment
Answer: C
Rationale: Loss of plasma membrane integrity signifies
irreversible cell injury and cell death.
Q2. Oxidative stress damages cells primarily through:
A. Increased glucose uptake
B. Lipid peroxidation of membranes
C. Protein synthesis
D. DNA replication
,2
Answer: B
Rationale: Free radicals attack membrane lipids, leading to loss
of integrity.
Q3. Apoptosis differs from necrosis because apoptosis:
A. Causes inflammation
B. Results from hypoxia
C. Requires ATP
D. Involves cell swelling
Answer: C
Rationale: Apoptosis is energy-dependent and genetically
regulated.
Q4. Cellular adaptation to chronic irritation resulting in
squamous cells replacing columnar cells is known as:
A. Dysplasia
B. Hyperplasia
C. Metaplasia
D. Atrophy
Answer: C
Rationale: Metaplasia is a reversible substitution of cell types to
better tolerate stress.
,3
Q5. Which organelle is MOST sensitive to hypoxic injury?
A. Lysosome
B. Nucleus
C. Mitochondria
D. Golgi apparatus
Answer: C
Rationale: Mitochondria require oxygen for ATP generation.
Q6. Increased intracellular calcium leads to cell injury by
activating:
A. Ribosomes
B. Proteases and phospholipases
C. Antioxidants
D. DNA polymerase
Answer: B
Rationale: Calcium activates enzymes that damage membranes
and proteins.
Q7. Dysplasia is clinically important because it:
A. Always progresses to cancer
B. Is irreversible
, 4
C. Is a premalignant change
D. Occurs only in connective tissue
Answer: C
Rationale: Dysplasia may progress to malignancy if persistent.
Q8. Cellular atrophy occurs due to:
A. Increased workload
B. Reduced nutrition or blood supply
C. Increased hormone levels
D. Genetic mutation
Answer: B
Rationale: Lack of nutrients or oxygen causes cell shrinkage.
Q9. Which protein regulates mitochondrial apoptosis?
A. Albumin
B. BCL-2
C. Hemoglobin
D. Insulin
Answer: B
Rationale: BCL-2 family proteins control cytochrome c release.
Q10. Caseous necrosis is MOST commonly associated with:
PATHOPHYSIOLOGY EXAM 1 & FINAL – QUESTIONS
AND ANSWERS WITH RATIONALES 2026 JUST
RELEASED VERSION
SECTION A: CELLULAR & MOLECULAR PATHOPHYSIOLOGY (Q1–
20)
Q1. Which event marks the point of NO RETURN in cell injury?
A. Mitochondrial swelling
B. ATP depletion
C. Plasma membrane disruption
D. Ribosomal detachment
Answer: C
Rationale: Loss of plasma membrane integrity signifies
irreversible cell injury and cell death.
Q2. Oxidative stress damages cells primarily through:
A. Increased glucose uptake
B. Lipid peroxidation of membranes
C. Protein synthesis
D. DNA replication
,2
Answer: B
Rationale: Free radicals attack membrane lipids, leading to loss
of integrity.
Q3. Apoptosis differs from necrosis because apoptosis:
A. Causes inflammation
B. Results from hypoxia
C. Requires ATP
D. Involves cell swelling
Answer: C
Rationale: Apoptosis is energy-dependent and genetically
regulated.
Q4. Cellular adaptation to chronic irritation resulting in
squamous cells replacing columnar cells is known as:
A. Dysplasia
B. Hyperplasia
C. Metaplasia
D. Atrophy
Answer: C
Rationale: Metaplasia is a reversible substitution of cell types to
better tolerate stress.
,3
Q5. Which organelle is MOST sensitive to hypoxic injury?
A. Lysosome
B. Nucleus
C. Mitochondria
D. Golgi apparatus
Answer: C
Rationale: Mitochondria require oxygen for ATP generation.
Q6. Increased intracellular calcium leads to cell injury by
activating:
A. Ribosomes
B. Proteases and phospholipases
C. Antioxidants
D. DNA polymerase
Answer: B
Rationale: Calcium activates enzymes that damage membranes
and proteins.
Q7. Dysplasia is clinically important because it:
A. Always progresses to cancer
B. Is irreversible
, 4
C. Is a premalignant change
D. Occurs only in connective tissue
Answer: C
Rationale: Dysplasia may progress to malignancy if persistent.
Q8. Cellular atrophy occurs due to:
A. Increased workload
B. Reduced nutrition or blood supply
C. Increased hormone levels
D. Genetic mutation
Answer: B
Rationale: Lack of nutrients or oxygen causes cell shrinkage.
Q9. Which protein regulates mitochondrial apoptosis?
A. Albumin
B. BCL-2
C. Hemoglobin
D. Insulin
Answer: B
Rationale: BCL-2 family proteins control cytochrome c release.
Q10. Caseous necrosis is MOST commonly associated with:
