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NURS 6501 Advanced Pathophysiology Walden
University Midterm Exam Actual Exam 2025/2026 –
Complete Exam-Style Questions with Detailed
Rationales | Pass Guaranteed – A+ Graded
[SECTION 1: Cellular Biology & Genetics — Questions 1-15]
Q1: A 55-year-old male patient presents with a history of chronic smoking and a recent
"smoker’s cough." A biopsy of the bronchial lining reveals a change in the epithelial cells from
ciliated columnar to stratified squamous epithelium. Which of the following cellular adaptations
best describes this finding?
A. Hyperplasia
B. Metaplasia
C. Metaplasia [CORRECT]
D. Dysplasia
Correct Answer: C
Rationale: Metaplasia is the reversible replacement of one differentiated cell type with another,
often in response to chronic irritation or stress; in this case, the persistent irritation from tobacco
smoke induces the transformation of ciliated pseudostratified columnar cells (which are effective
at moving mucus) to stratified squamous cells (which are more resistant to smoke but lack ciliary
action). This adaptive response, while protective against the insult, impairs the mucociliary
clearance mechanism, predisposing the patient to infections and chronic bronchitis. Hyperplasia
refers to an increase in the number of cells, not a change in type; dysplasia refers to disordered
cellular growth and is often a precancerous change, not merely an adaptive substitution.
Q2: A 2-year-old child is diagnosed with Failure to Thrive (FTT). The pediatrician explains that
the child’s muscle cells have decreased in size due to a lack of adequate nutrition. Which specific
cellular alteration is responsible for this reduction in cell size?
A. Hypertrophy
B. Hyperplasia
C. Atrophy [CORRECT]
,2
D. Apoptosis
Correct Answer: C
Rationale: Atrophy is defined as a decrease in the size of cells, resulting in a reduction in the
tissue mass; when caused by inadequate nutrition (malnutrition), the cells synthesize fewer
structural components and undergo autophagic degradation to survive. This physiological
adaptation allows the organism to conserve energy and vital nutrients during periods of scarcity,
though it compromises function. Hypertrophy is an increase in cell size (e.g., cardiac muscle in
hypertension); hyperplasia is an increase in cell number; and apoptosis is programmed cell death,
which differs from the generalized shrinkage seen in atrophy.
Q3: A patient with a history of uncontrolled hypertension presents with left ventricular
hypertrophy. The mechanism underlying the enlargement of the cardiac myocytes is best
described by which of the following?
A. Increased hormonal stimulation by thyroid hormone
B. Increased workload leading to synthesis of more structural proteins
C. Increased workload leading to synthesis of more structural proteins [CORRECT]
D. Cellular edema secondary to ion pump failure
Correct Answer: C
Rationale: Hypertrophy in cardiac myocytes is primarily a compensatory response to increased
mechanical workload (pressure overload from hypertension) or trophic signals (such as
angiotensin II or norepinephrine), leading to the synthesis of new cellular organelles and an
increase in cell size to normalize wall stress. Unlike hyperplasia, which involves cell division,
hypertrophy involves existing cells becoming larger to handle the increased demand. If the stress
persists, the compensated hypertrophy can progress to ventricular dilation and failure; options A
and D do not describe the primary adaptive mechanism for this condition.
Q4: A biopsy of a precancerous lesion of the cervix reveals disorganized growth with variations
in cell size and shape, and hyperchromatic nuclei. This finding is most accurately termed:
A. Anaplasia
B. Metaplasia
,3
C. Dysplasia [CORRECT]
D. Hyperplasia
Correct Answer: C
Rationale: Dysplasia is characterized by disordered cellular growth and maturation, specifically
deranged epithelial cell architecture with pleomorphism (variation in size/shape),
hyperchromasia (dark staining nuclei), and loss of polarity. It is often a reversible process if the
inciting stimulus (e.g., HPV infection) is removed, but it is considered a premalignant lesion
because it shares morphological features with malignancy (loss of differentiation). Anaplasia
refers to undifferentiated cells typical of malignant cancer; metaplasia is a reversible change of
one cell type to another; hyperplasia is an increase in cell number but with normal architecture.
Q5: A 25-year-old female presents with recurrent deep vein thrombosis (DVT). Genetic testing
reveals a mutation in Factor V (Factor V Leiden). Which type of genetic mutation does this
represent?
A. Frameshift mutation
B. Nonsense mutation
C. Missense mutation [CORRECT]
D. Silent mutation
Correct Answer: C
Rationale: Factor V Leiden is the result of a point mutation where a single nucleotide substitution
(G1691A) leads to the replacement of arginine with glutamine at position 506; this is a missense
mutation, which changes the amino acid sequence and results in a protein (Factor V) that is
resistant to deactivation by activated Protein C. This resistance leads to a hypercoagulable state,
increasing the risk of thrombosis. A frameshift mutation alters the reading frame of the codons; a
nonsense mutation creates a premature stop codon; and a silent mutation changes the nucleotide
without changing the amino acid.
Q6: A patient suffers a myocardial infarction. During the ischemic event, cardiomyocytes switch
from aerobic metabolism to anaerobic metabolism. Which cellular consequence is the direct
result of this metabolic shift?
, 4
A. Depletion of ATP and failure of the sodium-potassium pump
B. Depletion of ATP and failure of the sodium-potassium pump [CORRECT]
C. Increased protein synthesis
D. Activation of DNA repair mechanisms
Correct Answer: A
Rationale: Ischemia leads to hypoxia, forcing cells to rely on anaerobic glycolysis, which
produces significantly less ATP per glucose molecule than the Krebs cycle and oxidative
phosphorylation. The rapid depletion of ATP causes failure of energy-dependent ion pumps,
specifically the Na+/K+-ATPase, leading to an accumulation of sodium inside the cell and
subsequent cellular swelling (hydropic degeneration). This failure also triggers calcium influx
and mitochondrial damage, eventually leading to irreversible cell injury and necrosis if oxygen is
not restored.
Q7: A newborn is diagnosed with cri-du-chat syndrome. Which chromosomal abnormality is the
cause of this condition?
A. Trisomy 21
B. Translocation t(9;22)
C. Deletion 5p- [CORRECT]
D. Monosomy X
Correct Answer: C
Rationale: Cri-du-chat syndrome is caused by a deletion on the short arm of chromosome 5 (5p-),
which is distinct from the full chromosome loss seen in monosomy or the addition seen in
trisomy. The deletion results in distinct clinical features including a high-pitched cry resembling
a cat, microcephaly, intellectual disability, and facial dysmorphisms. Trisomy 21 causes Down
syndrome; translocation t(9;22) is associated with Chronic Myeloid Leukemia (CML); and
Monosomy X (Turner syndrome) presents with gonadal dysgenesis and short stature.
Q8: Which of the following describes the mechanism of cell death characterized by cell
shrinkage, chromatin condensation, and formation of apoptotic bodies without inflammation?
NURS 6501 Advanced Pathophysiology Walden
University Midterm Exam Actual Exam 2025/2026 –
Complete Exam-Style Questions with Detailed
Rationales | Pass Guaranteed – A+ Graded
[SECTION 1: Cellular Biology & Genetics — Questions 1-15]
Q1: A 55-year-old male patient presents with a history of chronic smoking and a recent
"smoker’s cough." A biopsy of the bronchial lining reveals a change in the epithelial cells from
ciliated columnar to stratified squamous epithelium. Which of the following cellular adaptations
best describes this finding?
A. Hyperplasia
B. Metaplasia
C. Metaplasia [CORRECT]
D. Dysplasia
Correct Answer: C
Rationale: Metaplasia is the reversible replacement of one differentiated cell type with another,
often in response to chronic irritation or stress; in this case, the persistent irritation from tobacco
smoke induces the transformation of ciliated pseudostratified columnar cells (which are effective
at moving mucus) to stratified squamous cells (which are more resistant to smoke but lack ciliary
action). This adaptive response, while protective against the insult, impairs the mucociliary
clearance mechanism, predisposing the patient to infections and chronic bronchitis. Hyperplasia
refers to an increase in the number of cells, not a change in type; dysplasia refers to disordered
cellular growth and is often a precancerous change, not merely an adaptive substitution.
Q2: A 2-year-old child is diagnosed with Failure to Thrive (FTT). The pediatrician explains that
the child’s muscle cells have decreased in size due to a lack of adequate nutrition. Which specific
cellular alteration is responsible for this reduction in cell size?
A. Hypertrophy
B. Hyperplasia
C. Atrophy [CORRECT]
,2
D. Apoptosis
Correct Answer: C
Rationale: Atrophy is defined as a decrease in the size of cells, resulting in a reduction in the
tissue mass; when caused by inadequate nutrition (malnutrition), the cells synthesize fewer
structural components and undergo autophagic degradation to survive. This physiological
adaptation allows the organism to conserve energy and vital nutrients during periods of scarcity,
though it compromises function. Hypertrophy is an increase in cell size (e.g., cardiac muscle in
hypertension); hyperplasia is an increase in cell number; and apoptosis is programmed cell death,
which differs from the generalized shrinkage seen in atrophy.
Q3: A patient with a history of uncontrolled hypertension presents with left ventricular
hypertrophy. The mechanism underlying the enlargement of the cardiac myocytes is best
described by which of the following?
A. Increased hormonal stimulation by thyroid hormone
B. Increased workload leading to synthesis of more structural proteins
C. Increased workload leading to synthesis of more structural proteins [CORRECT]
D. Cellular edema secondary to ion pump failure
Correct Answer: C
Rationale: Hypertrophy in cardiac myocytes is primarily a compensatory response to increased
mechanical workload (pressure overload from hypertension) or trophic signals (such as
angiotensin II or norepinephrine), leading to the synthesis of new cellular organelles and an
increase in cell size to normalize wall stress. Unlike hyperplasia, which involves cell division,
hypertrophy involves existing cells becoming larger to handle the increased demand. If the stress
persists, the compensated hypertrophy can progress to ventricular dilation and failure; options A
and D do not describe the primary adaptive mechanism for this condition.
Q4: A biopsy of a precancerous lesion of the cervix reveals disorganized growth with variations
in cell size and shape, and hyperchromatic nuclei. This finding is most accurately termed:
A. Anaplasia
B. Metaplasia
,3
C. Dysplasia [CORRECT]
D. Hyperplasia
Correct Answer: C
Rationale: Dysplasia is characterized by disordered cellular growth and maturation, specifically
deranged epithelial cell architecture with pleomorphism (variation in size/shape),
hyperchromasia (dark staining nuclei), and loss of polarity. It is often a reversible process if the
inciting stimulus (e.g., HPV infection) is removed, but it is considered a premalignant lesion
because it shares morphological features with malignancy (loss of differentiation). Anaplasia
refers to undifferentiated cells typical of malignant cancer; metaplasia is a reversible change of
one cell type to another; hyperplasia is an increase in cell number but with normal architecture.
Q5: A 25-year-old female presents with recurrent deep vein thrombosis (DVT). Genetic testing
reveals a mutation in Factor V (Factor V Leiden). Which type of genetic mutation does this
represent?
A. Frameshift mutation
B. Nonsense mutation
C. Missense mutation [CORRECT]
D. Silent mutation
Correct Answer: C
Rationale: Factor V Leiden is the result of a point mutation where a single nucleotide substitution
(G1691A) leads to the replacement of arginine with glutamine at position 506; this is a missense
mutation, which changes the amino acid sequence and results in a protein (Factor V) that is
resistant to deactivation by activated Protein C. This resistance leads to a hypercoagulable state,
increasing the risk of thrombosis. A frameshift mutation alters the reading frame of the codons; a
nonsense mutation creates a premature stop codon; and a silent mutation changes the nucleotide
without changing the amino acid.
Q6: A patient suffers a myocardial infarction. During the ischemic event, cardiomyocytes switch
from aerobic metabolism to anaerobic metabolism. Which cellular consequence is the direct
result of this metabolic shift?
, 4
A. Depletion of ATP and failure of the sodium-potassium pump
B. Depletion of ATP and failure of the sodium-potassium pump [CORRECT]
C. Increased protein synthesis
D. Activation of DNA repair mechanisms
Correct Answer: A
Rationale: Ischemia leads to hypoxia, forcing cells to rely on anaerobic glycolysis, which
produces significantly less ATP per glucose molecule than the Krebs cycle and oxidative
phosphorylation. The rapid depletion of ATP causes failure of energy-dependent ion pumps,
specifically the Na+/K+-ATPase, leading to an accumulation of sodium inside the cell and
subsequent cellular swelling (hydropic degeneration). This failure also triggers calcium influx
and mitochondrial damage, eventually leading to irreversible cell injury and necrosis if oxygen is
not restored.
Q7: A newborn is diagnosed with cri-du-chat syndrome. Which chromosomal abnormality is the
cause of this condition?
A. Trisomy 21
B. Translocation t(9;22)
C. Deletion 5p- [CORRECT]
D. Monosomy X
Correct Answer: C
Rationale: Cri-du-chat syndrome is caused by a deletion on the short arm of chromosome 5 (5p-),
which is distinct from the full chromosome loss seen in monosomy or the addition seen in
trisomy. The deletion results in distinct clinical features including a high-pitched cry resembling
a cat, microcephaly, intellectual disability, and facial dysmorphisms. Trisomy 21 causes Down
syndrome; translocation t(9;22) is associated with Chronic Myeloid Leukemia (CML); and
Monosomy X (Turner syndrome) presents with gonadal dysgenesis and short stature.
Q8: Which of the following describes the mechanism of cell death characterized by cell
shrinkage, chromatin condensation, and formation of apoptotic bodies without inflammation?
