1
WGU D115 OA ADVANCED PATHOPHYSIOLOGY 2026/2027 |
Dual Version Test Bank | Expert Verified | A+ Grade | Pass
Guaranteed
VERSION A
Section A1: Cellular Adaptation, Injury & Neoplasia (A1-10)
A1. A 68-year-old male with prostate cancer and bone metastases has developed
widespread muscle wasting in his lower extremities. This decrease in cell size and
number is best classified as:
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
C. Atrophy [CORRECT]
Rationale: Atrophy is a decrease in cell size and number due to decreased workload,
ischemia, malnutrition, or hormonal stimulation loss; muscle wasting in cachexia
represents disuse and protein catabolism-driven atrophy, not hypertrophy (increase
in size) or hyperplasia (increase in number).
Correct Answer: C
A2. A 45-year-old female with chronic gastroesophageal reflux disease is found to
have columnar epithelium with goblet cells in the distal esophagus on endoscopy.
This cellular replacement is termed:
A. Dysplasia
B. Metaplasia
C. Anaplasia
D. Hyperplasia
B. Metaplasia [CORRECT]
,2
Rationale: Metaplasia is the reversible replacement of one differentiated cell type
with another, as seen in Barrett esophagus where squamous epithelium is replaced
by intestinal-type columnar epithelium in response to chronic acid exposure; it is a
protective adaptation but increases cancer risk.
Correct Answer: B
A3. A patient with a history of myocardial infarction 2 days ago dies. Autopsy reveals
myocardial tissue with preserved tissue architecture but loss of nuclei and
eosinophilic cytoplasm. This type of necrosis is:
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis
D. Fat necrosis
C. Coagulative necrosis [CORRECT]
Rationale: Coagulative necrosis is characteristic of ischemic injury in solid organs
(heart, kidney, spleen) where protein denaturation preserves tissue architecture
temporarily; liquefactive necrosis occurs in brain abscesses, and caseous necrosis is
seen in tuberculosis.
Correct Answer: C
A4. A patient in hemorrhagic shock develops cellular injury. Which intracellular event
is the earliest and most critical trigger for irreversible cell damage?
A. Lysosomal enzyme release
B. Calcium overload and ATP depletion
C. Ribosomal detachment
D. Nuclear chromatin clumping
B. Calcium overload and ATP depletion [CORRECT]
,3
Rationale: ATP depletion from hypoxia causes failure of the Na+/K+ pump and Ca2+
sequestration, leading to cytosolic calcium overload that activates phospholipases
and proteases, causing irreversible membrane damage; this is the central mechanism
in ischemic cell injury.
Correct Answer: B
A5. During embryonic development, interdigital tissue is removed to form separate
fingers. This programmed cell death is an example of:
A. Necrosis
B. Apoptosis
C. Autophagy
D. Pyroptosis
B. Apoptosis [CORRECT]
Rationale: Apoptosis is energy-dependent programmed cell death characterized by
cell shrinkage, chromatin condensation, and formation of apoptotic bodies without
inflammation; it is essential for embryonic morphogenesis, unlike necrosis which is
passive and inflammatory.
Correct Answer: B
A6. A patient with acute pancreatitis develops chalky white deposits in the
peripancreatic fat. Microscopically, these deposits show shadowy outlines of necrotic
adipocytes with basophilic calcium deposits. This is characteristic of:
A. Caseous necrosis
B. Liquefactive necrosis
C. Fat necrosis
D. Fibrinoid necrosis
C. Fat necrosis [CORRECT]
, 4
Rationale: Fat necrosis occurs when lipases (activated in pancreatitis) hydrolyze
triglycerides into fatty acids that combine with calcium to form chalky soaps
(saponification); it is specific to adipose tissue injury in pancreatitis and breast
trauma.
Correct Answer: C
A7. A patient inherits a mutated gene that normally functions to arrest the cell cycle
and repair DNA damage. Loss of function of this gene contributes to uncontrolled
proliferation. This gene is best classified as:
A. An oncogene
B. A tumor suppressor gene
C. A proto-oncogene
D. A mutator gene
B. A tumor suppressor gene [CORRECT]
Rationale: Tumor suppressor genes (e.g., p53, Rb) encode proteins that inhibit cell
cycle progression and promote DNA repair or apoptosis; loss of both alleles
(Knudson two-hit hypothesis) removes the brake on proliferation, unlike oncogenes
which are overactive growth promoters.
Correct Answer: B
A8. A 55-year-old smoker develops squamous cell carcinoma of the lung. The
sequence from normal bronchial epithelium to carcinoma most likely progressed
through which stages of carcinogenesis?
A. Initiation → promotion → progression
B. Promotion → initiation → progression
C. Progression → promotion → initiation
D. Metaplasia → dysplasia → promotion only
A. Initiation → promotion → progression [CORRECT]
WGU D115 OA ADVANCED PATHOPHYSIOLOGY 2026/2027 |
Dual Version Test Bank | Expert Verified | A+ Grade | Pass
Guaranteed
VERSION A
Section A1: Cellular Adaptation, Injury & Neoplasia (A1-10)
A1. A 68-year-old male with prostate cancer and bone metastases has developed
widespread muscle wasting in his lower extremities. This decrease in cell size and
number is best classified as:
A. Hypertrophy
B. Hyperplasia
C. Atrophy
D. Metaplasia
C. Atrophy [CORRECT]
Rationale: Atrophy is a decrease in cell size and number due to decreased workload,
ischemia, malnutrition, or hormonal stimulation loss; muscle wasting in cachexia
represents disuse and protein catabolism-driven atrophy, not hypertrophy (increase
in size) or hyperplasia (increase in number).
Correct Answer: C
A2. A 45-year-old female with chronic gastroesophageal reflux disease is found to
have columnar epithelium with goblet cells in the distal esophagus on endoscopy.
This cellular replacement is termed:
A. Dysplasia
B. Metaplasia
C. Anaplasia
D. Hyperplasia
B. Metaplasia [CORRECT]
,2
Rationale: Metaplasia is the reversible replacement of one differentiated cell type
with another, as seen in Barrett esophagus where squamous epithelium is replaced
by intestinal-type columnar epithelium in response to chronic acid exposure; it is a
protective adaptation but increases cancer risk.
Correct Answer: B
A3. A patient with a history of myocardial infarction 2 days ago dies. Autopsy reveals
myocardial tissue with preserved tissue architecture but loss of nuclei and
eosinophilic cytoplasm. This type of necrosis is:
A. Liquefactive necrosis
B. Caseous necrosis
C. Coagulative necrosis
D. Fat necrosis
C. Coagulative necrosis [CORRECT]
Rationale: Coagulative necrosis is characteristic of ischemic injury in solid organs
(heart, kidney, spleen) where protein denaturation preserves tissue architecture
temporarily; liquefactive necrosis occurs in brain abscesses, and caseous necrosis is
seen in tuberculosis.
Correct Answer: C
A4. A patient in hemorrhagic shock develops cellular injury. Which intracellular event
is the earliest and most critical trigger for irreversible cell damage?
A. Lysosomal enzyme release
B. Calcium overload and ATP depletion
C. Ribosomal detachment
D. Nuclear chromatin clumping
B. Calcium overload and ATP depletion [CORRECT]
,3
Rationale: ATP depletion from hypoxia causes failure of the Na+/K+ pump and Ca2+
sequestration, leading to cytosolic calcium overload that activates phospholipases
and proteases, causing irreversible membrane damage; this is the central mechanism
in ischemic cell injury.
Correct Answer: B
A5. During embryonic development, interdigital tissue is removed to form separate
fingers. This programmed cell death is an example of:
A. Necrosis
B. Apoptosis
C. Autophagy
D. Pyroptosis
B. Apoptosis [CORRECT]
Rationale: Apoptosis is energy-dependent programmed cell death characterized by
cell shrinkage, chromatin condensation, and formation of apoptotic bodies without
inflammation; it is essential for embryonic morphogenesis, unlike necrosis which is
passive and inflammatory.
Correct Answer: B
A6. A patient with acute pancreatitis develops chalky white deposits in the
peripancreatic fat. Microscopically, these deposits show shadowy outlines of necrotic
adipocytes with basophilic calcium deposits. This is characteristic of:
A. Caseous necrosis
B. Liquefactive necrosis
C. Fat necrosis
D. Fibrinoid necrosis
C. Fat necrosis [CORRECT]
, 4
Rationale: Fat necrosis occurs when lipases (activated in pancreatitis) hydrolyze
triglycerides into fatty acids that combine with calcium to form chalky soaps
(saponification); it is specific to adipose tissue injury in pancreatitis and breast
trauma.
Correct Answer: C
A7. A patient inherits a mutated gene that normally functions to arrest the cell cycle
and repair DNA damage. Loss of function of this gene contributes to uncontrolled
proliferation. This gene is best classified as:
A. An oncogene
B. A tumor suppressor gene
C. A proto-oncogene
D. A mutator gene
B. A tumor suppressor gene [CORRECT]
Rationale: Tumor suppressor genes (e.g., p53, Rb) encode proteins that inhibit cell
cycle progression and promote DNA repair or apoptosis; loss of both alleles
(Knudson two-hit hypothesis) removes the brake on proliferation, unlike oncogenes
which are overactive growth promoters.
Correct Answer: B
A8. A 55-year-old smoker develops squamous cell carcinoma of the lung. The
sequence from normal bronchial epithelium to carcinoma most likely progressed
through which stages of carcinogenesis?
A. Initiation → promotion → progression
B. Promotion → initiation → progression
C. Progression → promotion → initiation
D. Metaplasia → dysplasia → promotion only
A. Initiation → promotion → progression [CORRECT]
