WGU D115 Advanced Pathophysiology OA Exam Actual Exam 2026/2027 –
Comprehensive Readiness Assessment with Detailed Rationales | 100% Verified |
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Section 1: Cellular & Genetic Pathophysiology
Q1: A 45-year-old male with a 30-pack-year smoking history presents with a persistent
cough and hemoptysis. A lung biopsy reveals squamous metaplasia of the bronchial
epithelium. Which cellular adaptation is most likely occurring?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia [CORRECT]
D. Dysplasia
Correct Answer: C
Rationale: Metaplasia is the replacement of one differentiated cell type with another,
often in response to chronic irritation (e.g., smoking causing squamous metaplasia of
respiratory epithelium). A involves cell enlargement, not cell type replacement. B
involves increased cell number of the same type. D involves disordered, pre-neoplastic
cellular growth.
Q2: A patient suffers a myocardial infarction. The affected myocardial tissue shows
preserved tissue architecture with ghost outlines of cells but loss of nuclei and
cytoplasmic detail. Which type of necrosis is present?
A. Liquefactive necrosis
B. Coagulative necrosis [CORRECT]
,C. Caseous necrosis
D. Fat necrosis
Correct Answer: B
Rationale: Coagulative necrosis preserves tissue architecture for days due to
denaturation of structural and enzymatic proteins, characteristic of ischemic injury in
solid organs (heart, kidney, spleen). A occurs in brain and abscesses with tissue
liquefaction. C occurs in tuberculosis with cheese-like appearance. D occurs in breast
and pancreas with calcium deposits.
Q3: A patient with severe peripheral vascular disease develops dry gangrene of the toes.
Which pathophysiological process best explains this finding?
A. Liquefactive necrosis with bacterial infection
B. Coagulative necrosis without bacterial infection [CORRECT]
C. Caseous necrosis with granuloma formation
D. Fat necrosis with enzymatic digestion
Correct Answer: B
Rationale: Dry gangrene results from ischemic coagulative necrosis without bacterial
infection, leading to tissue mummification. A describes wet gangrene. C describes
tuberculosis. D describes pancreatitis or breast trauma.
Q4: A 25-year-old woman presents with recurrent infections and is found to have a
mutation in the Fas gene, leading to impaired apoptosis. Which condition is most likely?
A. Autoimmune lymphoproliferative syndrome (ALPS) [CORRECT]
B. Cystic fibrosis
C. Huntington disease
D. Sickle cell anemia
,Correct Answer: A
Rationale: ALPS results from Fas gene mutations impairing lymphocyte apoptosis,
causing lymphadenopathy, splenomegaly, and autoimmunity. B results from CFTR
chloride channel mutations. C involves CAG repeat expansion in huntingtin gene. D
involves beta-globin gene mutation.
Q5: A patient with reperfusion injury after thrombolytic therapy for MI shows tissue
damage attributed to reactive oxygen species. Which molecule is most responsible for
initiating free radical injury?
A. Superoxide anion (O₂⁻) [CORRECT]
B. Nitric oxide
C. Carbon dioxide
D. Hydrogen peroxide alone
Correct Answer: A
Rationale: Superoxide anion is the primary free radical generated during reperfusion,
which then forms hydrogen peroxide and hydroxyl radicals via the Fenton reaction. B is
a signaling molecule but not the primary initiator. C is not a free radical. D requires
conversion from superoxide to become highly reactive.
Q6: A newborn with low-set ears, a webbed neck, and widely spaced nipples is found to
have only one X chromosome. Which chromosomal abnormality is present?
A. Klinefelter syndrome (47,XXY)
B. Turner syndrome (45,X) [CORRECT]
C. Down syndrome (Trisomy 21)
D. Triple X syndrome (47,XXX)
Correct Answer: B
, Rationale: Turner syndrome (45,X) presents with short stature, webbed neck, low-set
ears, and primary ovarian insufficiency. A presents in males with hypogonadism. C
presents with intellectual disability and characteristic facies. D is usually asymptomatic.
Q7: A patient with chronic alcoholism develops hepatic steatosis. Which cellular
adaptation is primarily responsible?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Fatty change (steatosis) - accumulation of triglycerides [CORRECT]
Correct Answer: D
Rationale: Fatty change (steatosis) is the accumulation of triglycerides in hepatocytes
due to impaired lipoprotein synthesis and altered metabolism from alcohol toxicity. A, B,
and C do not describe lipid accumulation.
Q8: A patient with a BRCA1 gene mutation has a significantly increased lifetime risk of
breast and ovarian cancer. Which inheritance pattern is demonstrated?
A. Autosomal recessive
B. Autosomal dominant [CORRECT]
C. X-linked recessive
D. Mitochondrial inheritance
Correct Answer: B
Rationale: BRCA1 mutations follow autosomal dominant inheritance with high
penetrance. A requires two mutated alleles. C affects males predominantly. D is
maternal inheritance affecting energy-producing tissues.
Comprehensive Readiness Assessment with Detailed Rationales | 100% Verified |
Pass Guaranteed – A+ Graded
Section 1: Cellular & Genetic Pathophysiology
Q1: A 45-year-old male with a 30-pack-year smoking history presents with a persistent
cough and hemoptysis. A lung biopsy reveals squamous metaplasia of the bronchial
epithelium. Which cellular adaptation is most likely occurring?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia [CORRECT]
D. Dysplasia
Correct Answer: C
Rationale: Metaplasia is the replacement of one differentiated cell type with another,
often in response to chronic irritation (e.g., smoking causing squamous metaplasia of
respiratory epithelium). A involves cell enlargement, not cell type replacement. B
involves increased cell number of the same type. D involves disordered, pre-neoplastic
cellular growth.
Q2: A patient suffers a myocardial infarction. The affected myocardial tissue shows
preserved tissue architecture with ghost outlines of cells but loss of nuclei and
cytoplasmic detail. Which type of necrosis is present?
A. Liquefactive necrosis
B. Coagulative necrosis [CORRECT]
,C. Caseous necrosis
D. Fat necrosis
Correct Answer: B
Rationale: Coagulative necrosis preserves tissue architecture for days due to
denaturation of structural and enzymatic proteins, characteristic of ischemic injury in
solid organs (heart, kidney, spleen). A occurs in brain and abscesses with tissue
liquefaction. C occurs in tuberculosis with cheese-like appearance. D occurs in breast
and pancreas with calcium deposits.
Q3: A patient with severe peripheral vascular disease develops dry gangrene of the toes.
Which pathophysiological process best explains this finding?
A. Liquefactive necrosis with bacterial infection
B. Coagulative necrosis without bacterial infection [CORRECT]
C. Caseous necrosis with granuloma formation
D. Fat necrosis with enzymatic digestion
Correct Answer: B
Rationale: Dry gangrene results from ischemic coagulative necrosis without bacterial
infection, leading to tissue mummification. A describes wet gangrene. C describes
tuberculosis. D describes pancreatitis or breast trauma.
Q4: A 25-year-old woman presents with recurrent infections and is found to have a
mutation in the Fas gene, leading to impaired apoptosis. Which condition is most likely?
A. Autoimmune lymphoproliferative syndrome (ALPS) [CORRECT]
B. Cystic fibrosis
C. Huntington disease
D. Sickle cell anemia
,Correct Answer: A
Rationale: ALPS results from Fas gene mutations impairing lymphocyte apoptosis,
causing lymphadenopathy, splenomegaly, and autoimmunity. B results from CFTR
chloride channel mutations. C involves CAG repeat expansion in huntingtin gene. D
involves beta-globin gene mutation.
Q5: A patient with reperfusion injury after thrombolytic therapy for MI shows tissue
damage attributed to reactive oxygen species. Which molecule is most responsible for
initiating free radical injury?
A. Superoxide anion (O₂⁻) [CORRECT]
B. Nitric oxide
C. Carbon dioxide
D. Hydrogen peroxide alone
Correct Answer: A
Rationale: Superoxide anion is the primary free radical generated during reperfusion,
which then forms hydrogen peroxide and hydroxyl radicals via the Fenton reaction. B is
a signaling molecule but not the primary initiator. C is not a free radical. D requires
conversion from superoxide to become highly reactive.
Q6: A newborn with low-set ears, a webbed neck, and widely spaced nipples is found to
have only one X chromosome. Which chromosomal abnormality is present?
A. Klinefelter syndrome (47,XXY)
B. Turner syndrome (45,X) [CORRECT]
C. Down syndrome (Trisomy 21)
D. Triple X syndrome (47,XXX)
Correct Answer: B
, Rationale: Turner syndrome (45,X) presents with short stature, webbed neck, low-set
ears, and primary ovarian insufficiency. A presents in males with hypogonadism. C
presents with intellectual disability and characteristic facies. D is usually asymptomatic.
Q7: A patient with chronic alcoholism develops hepatic steatosis. Which cellular
adaptation is primarily responsible?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Fatty change (steatosis) - accumulation of triglycerides [CORRECT]
Correct Answer: D
Rationale: Fatty change (steatosis) is the accumulation of triglycerides in hepatocytes
due to impaired lipoprotein synthesis and altered metabolism from alcohol toxicity. A, B,
and C do not describe lipid accumulation.
Q8: A patient with a BRCA1 gene mutation has a significantly increased lifetime risk of
breast and ovarian cancer. Which inheritance pattern is demonstrated?
A. Autosomal recessive
B. Autosomal dominant [CORRECT]
C. X-linked recessive
D. Mitochondrial inheritance
Correct Answer: B
Rationale: BRCA1 mutations follow autosomal dominant inheritance with high
penetrance. A requires two mutated alleles. C affects males predominantly. D is
maternal inheritance affecting energy-producing tissues.
