TEST BANK FOR WGU D115 OA / D115 OA PREP 2026/2027 WITH 450 EXAM QUESTIONS
AND VERIFIED ANSWERS WITH RATIONALES
SECTION 1: CELLULAR ADAPTATION, INJURY, AND NEOPLASIA
1. A patient with chronic obstructive pulmonary disease (COPD) exhibits squamous
metaplasia in the bronchial epithelium. Which statement best explains this cellular
adaptation?
A. Replacement of columnar epithelium with stratified squamous epithelium to withstand
chronic irritation
B. Increase in cell size due to increased workload
C. Decrease in cell size due to reduced blood supply
D. Transformation of cells into a different tissue type
Answer: A
Rationale: Squamous metaplasia is a reversible change where one differentiated cell type
is replaced by another better suited to withstand chronic irritation or injury. In COPD,
chronic smoke exposure causes columnar epithelial cells to transform into squamous
cells. Option B describes hypertrophy, C describes atrophy, and D describes dysplasia.
2. A 52-year-old patient with chronic alcoholism develops liver cirrhosis. Which
pathophysiological process is primarily responsible for the formation of Mallory
bodies in hepatocytes?
A. Accumulation of fat droplets within the cytoplasm
B. Aggregation of intermediate filaments from damaged cytoskeleton
C. Deposition of amyloid protein in the extracellular space
D. Accumulation of glycogen in the nucleus
Answer: B
Rationale: Mallory bodies are intracytoplasmic inclusions composed of aggregated
intermediate filaments, specifically cytokeratin, that form in hepatocytes due to alcohol-
induced cytoskeletal damage. Option A describes fatty change (steatosis), C describes
amyloidosis, and D describes glycogen accumulation.
,3. A patient presents with a painless, firm, irregular breast mass. Biopsy reveals cells
with pleomorphism, hyperchromatic nuclei, and numerous mitotic figures. Which
term best characterizes these cellular changes?
A. Metaplasia
B. Dysplasia
C. Anaplasia
D. Hypertrophy
Answer: C
Rationale: Anaplasia refers to loss of differentiation in malignant cells, characterized by
pleomorphism, hyperchromasia, prominent nucleoli, and increased mitotic activity. Option
A describes replacement of one cell type, B describes abnormal cellular growth that is not
invasive, and D describes increased cell size.
4. Which mechanism best explains how cellular swelling occurs during hypoxic
injury?
A. Increased activity of the sodium-potassium pump leading to ion imbalance
B. Failure of the sodium-potassium pump causing sodium influx and water movement
C. Enhanced calcium efflux from the endoplasmic reticulum
D. Increased ATP production leading to osmotic imbalance
Answer: B
Rationale: Hypoxia reduces ATP production, impairing the sodium-potassium pump.
Sodium accumulates intracellularly, drawing water into the cell and causing swelling.
Option A is incorrect as the pump fails, C describes calcium handling, and D is opposite to
actual ATP depletion.
5. A patient's liver biopsy reveals ground-glass hepatocytes. Which condition is most
likely associated with this finding?
A. Hepatitis B virus infection
B. Hepatitis C virus infection
C. Alcoholic liver disease
D. Hemochromatosis
Answer: A
Rationale: Ground-glass hepatocytes are characteristic of chronic hepatitis B infection,
representing accumulation of hepatitis B surface antigen (HBsAg) in the endoplasmic
reticulum. Option B shows lymphoid aggregates, C shows Mallory bodies, and D shows
hemosiderin deposits.
6. A 65-year-old patient with Barrett's esophagus is at risk for developing
adenocarcinoma. Which cellular change represents the earliest neoplastic
,transformation in this condition?
A. Squamous metaplasia
B. Intestinal metaplasia with dysplasia
C. Hyperplasia of glandular cells
D. Hypertrophy of smooth muscle
Answer: B
Rationale: Barrett's esophagus involves intestinal metaplasia of the esophageal squamous
epithelium. Dysplasia within this metaplastic epithelium represents the earliest neoplastic
transformation. Option A is the initial process, C describes increased cell number, and D
describes muscle changes.
7. In a patient with chronic inflammation, repeated tissue injury leads to replacement
of damaged tissue by granulation tissue. What is the primary composition of
granulation tissue?
A. Mature collagen and fibroblasts
B. New blood vessels, fibroblasts, and inflammatory cells
C. Adipose tissue and macrophages
D. Fibrous scar and elastic fibers
Answer: B
Rationale: Granulation tissue is composed of proliferating new blood vessels
(angiogenesis), fibroblasts, and inflammatory cells. Option A describes mature scar tissue,
C is not granulation tissue, and D describes mature fibrotic tissue.
8. A patient with myocardial infarction experiences cell death in the affected area.
Which morphological change is most characteristic of coagulative necrosis in the
heart?
A. Liquefaction of tissue with pus formation
B. Preservation of cellular outlines with loss of nuclei
C. Formation of caseous material resembling cheese
D. Fat accumulation in the necrotic area
Answer: B
Rationale: Coagulative necrosis, typical of ischemic injury in solid organs like the heart,
preserves cellular outlines while nuclei undergo pyknosis, karyorrhexis, and karyolysis.
Option A describes liquefactive necrosis, C describes caseous necrosis (TB), and D
describes fat necrosis.
9. Which mechanism explains how reperfusion injury exacerbates ischemic tissue
damage?
A. Reduced oxygen availability to damaged cells
, B. Generation of reactive oxygen species leading to oxidative stress
C. Decreased inflammatory response to necrotic tissue
D. Enhanced DNA repair mechanisms
Answer: B
Rationale: Reperfusion injury occurs when oxygen reintroduction to ischemic tissue
generates reactive oxygen species, leading to oxidative stress, mitochondrial damage, and
further cell death. Option A is incorrect as oxygen is restored, C is opposite of actual
response, and D would be protective.
10. A patient's tumor biopsy shows abnormal cells with loss of polarity and invasion
through the basement membrane. Which term best describes this cellular behavior?
A. Benign neoplasia
B. Carcinoma in situ
C. Invasive carcinoma
D. Borderline malignancy
Answer: C
Rationale: Invasive carcinoma is characterized by malignant cells that have breached the
basement membrane and invaded surrounding tissues. Option A describes non-invasive
tumors, B describes pre-invasive lesions, and D is not a standard classification.
11. A 50-year-old patient with BRCA1 mutation undergoes prophylactic mastectomy.
Which mechanism explains why BRCA1 mutation increases cancer risk?
A. Loss of function in DNA mismatch repair enzyme
B. Impaired homologous recombination repair of double-strand breaks
C. Constitutive activation of the PI3K/AKT pathway
D. Defective nucleotide excision repair of thymine dimers
Answer: B
Rationale: BRCA1 is essential for homologous recombination repair of DNA double-strand
breaks. Loss of function leads to genomic instability. Option A describes Lynch syndrome,
C is an oncogenic pathway, and D describes xeroderma pigmentosum.
12. Which cellular adaptation occurs in the uterus during pregnancy?
A. Hyperplasia
B. Hypertrophy
C. Metaplasia
D. Atrophy
Answer: A
Rationale: During pregnancy, estrogen and progesterone stimulate hyperplasia (increased
cell number) and hypertrophy (increased cell size) of uterine smooth muscle. However,
AND VERIFIED ANSWERS WITH RATIONALES
SECTION 1: CELLULAR ADAPTATION, INJURY, AND NEOPLASIA
1. A patient with chronic obstructive pulmonary disease (COPD) exhibits squamous
metaplasia in the bronchial epithelium. Which statement best explains this cellular
adaptation?
A. Replacement of columnar epithelium with stratified squamous epithelium to withstand
chronic irritation
B. Increase in cell size due to increased workload
C. Decrease in cell size due to reduced blood supply
D. Transformation of cells into a different tissue type
Answer: A
Rationale: Squamous metaplasia is a reversible change where one differentiated cell type
is replaced by another better suited to withstand chronic irritation or injury. In COPD,
chronic smoke exposure causes columnar epithelial cells to transform into squamous
cells. Option B describes hypertrophy, C describes atrophy, and D describes dysplasia.
2. A 52-year-old patient with chronic alcoholism develops liver cirrhosis. Which
pathophysiological process is primarily responsible for the formation of Mallory
bodies in hepatocytes?
A. Accumulation of fat droplets within the cytoplasm
B. Aggregation of intermediate filaments from damaged cytoskeleton
C. Deposition of amyloid protein in the extracellular space
D. Accumulation of glycogen in the nucleus
Answer: B
Rationale: Mallory bodies are intracytoplasmic inclusions composed of aggregated
intermediate filaments, specifically cytokeratin, that form in hepatocytes due to alcohol-
induced cytoskeletal damage. Option A describes fatty change (steatosis), C describes
amyloidosis, and D describes glycogen accumulation.
,3. A patient presents with a painless, firm, irregular breast mass. Biopsy reveals cells
with pleomorphism, hyperchromatic nuclei, and numerous mitotic figures. Which
term best characterizes these cellular changes?
A. Metaplasia
B. Dysplasia
C. Anaplasia
D. Hypertrophy
Answer: C
Rationale: Anaplasia refers to loss of differentiation in malignant cells, characterized by
pleomorphism, hyperchromasia, prominent nucleoli, and increased mitotic activity. Option
A describes replacement of one cell type, B describes abnormal cellular growth that is not
invasive, and D describes increased cell size.
4. Which mechanism best explains how cellular swelling occurs during hypoxic
injury?
A. Increased activity of the sodium-potassium pump leading to ion imbalance
B. Failure of the sodium-potassium pump causing sodium influx and water movement
C. Enhanced calcium efflux from the endoplasmic reticulum
D. Increased ATP production leading to osmotic imbalance
Answer: B
Rationale: Hypoxia reduces ATP production, impairing the sodium-potassium pump.
Sodium accumulates intracellularly, drawing water into the cell and causing swelling.
Option A is incorrect as the pump fails, C describes calcium handling, and D is opposite to
actual ATP depletion.
5. A patient's liver biopsy reveals ground-glass hepatocytes. Which condition is most
likely associated with this finding?
A. Hepatitis B virus infection
B. Hepatitis C virus infection
C. Alcoholic liver disease
D. Hemochromatosis
Answer: A
Rationale: Ground-glass hepatocytes are characteristic of chronic hepatitis B infection,
representing accumulation of hepatitis B surface antigen (HBsAg) in the endoplasmic
reticulum. Option B shows lymphoid aggregates, C shows Mallory bodies, and D shows
hemosiderin deposits.
6. A 65-year-old patient with Barrett's esophagus is at risk for developing
adenocarcinoma. Which cellular change represents the earliest neoplastic
,transformation in this condition?
A. Squamous metaplasia
B. Intestinal metaplasia with dysplasia
C. Hyperplasia of glandular cells
D. Hypertrophy of smooth muscle
Answer: B
Rationale: Barrett's esophagus involves intestinal metaplasia of the esophageal squamous
epithelium. Dysplasia within this metaplastic epithelium represents the earliest neoplastic
transformation. Option A is the initial process, C describes increased cell number, and D
describes muscle changes.
7. In a patient with chronic inflammation, repeated tissue injury leads to replacement
of damaged tissue by granulation tissue. What is the primary composition of
granulation tissue?
A. Mature collagen and fibroblasts
B. New blood vessels, fibroblasts, and inflammatory cells
C. Adipose tissue and macrophages
D. Fibrous scar and elastic fibers
Answer: B
Rationale: Granulation tissue is composed of proliferating new blood vessels
(angiogenesis), fibroblasts, and inflammatory cells. Option A describes mature scar tissue,
C is not granulation tissue, and D describes mature fibrotic tissue.
8. A patient with myocardial infarction experiences cell death in the affected area.
Which morphological change is most characteristic of coagulative necrosis in the
heart?
A. Liquefaction of tissue with pus formation
B. Preservation of cellular outlines with loss of nuclei
C. Formation of caseous material resembling cheese
D. Fat accumulation in the necrotic area
Answer: B
Rationale: Coagulative necrosis, typical of ischemic injury in solid organs like the heart,
preserves cellular outlines while nuclei undergo pyknosis, karyorrhexis, and karyolysis.
Option A describes liquefactive necrosis, C describes caseous necrosis (TB), and D
describes fat necrosis.
9. Which mechanism explains how reperfusion injury exacerbates ischemic tissue
damage?
A. Reduced oxygen availability to damaged cells
, B. Generation of reactive oxygen species leading to oxidative stress
C. Decreased inflammatory response to necrotic tissue
D. Enhanced DNA repair mechanisms
Answer: B
Rationale: Reperfusion injury occurs when oxygen reintroduction to ischemic tissue
generates reactive oxygen species, leading to oxidative stress, mitochondrial damage, and
further cell death. Option A is incorrect as oxygen is restored, C is opposite of actual
response, and D would be protective.
10. A patient's tumor biopsy shows abnormal cells with loss of polarity and invasion
through the basement membrane. Which term best describes this cellular behavior?
A. Benign neoplasia
B. Carcinoma in situ
C. Invasive carcinoma
D. Borderline malignancy
Answer: C
Rationale: Invasive carcinoma is characterized by malignant cells that have breached the
basement membrane and invaded surrounding tissues. Option A describes non-invasive
tumors, B describes pre-invasive lesions, and D is not a standard classification.
11. A 50-year-old patient with BRCA1 mutation undergoes prophylactic mastectomy.
Which mechanism explains why BRCA1 mutation increases cancer risk?
A. Loss of function in DNA mismatch repair enzyme
B. Impaired homologous recombination repair of double-strand breaks
C. Constitutive activation of the PI3K/AKT pathway
D. Defective nucleotide excision repair of thymine dimers
Answer: B
Rationale: BRCA1 is essential for homologous recombination repair of DNA double-strand
breaks. Loss of function leads to genomic instability. Option A describes Lynch syndrome,
C is an oncogenic pathway, and D describes xeroderma pigmentosum.
12. Which cellular adaptation occurs in the uterus during pregnancy?
A. Hyperplasia
B. Hypertrophy
C. Metaplasia
D. Atrophy
Answer: A
Rationale: During pregnancy, estrogen and progesterone stimulate hyperplasia (increased
cell number) and hypertrophy (increased cell size) of uterine smooth muscle. However,
