WGU D115 Advanced Pathophysiology Objective
Assessment (OA) | 2026 Edition Complete 116
Questions & Answers
Unit 1: Cellular Dynamics, Injury, and Genetic Pathology
1. A nurse practitioner is reviewing a pathology report for a client with a history of
chronic cigarette smoking. The report indicates that the normal ciliated columnar
epithelial cells of the respiratory tract have been replaced by stratified squamous
epithelial cells. How should the clinician document this reversible alteration?
A) Dysplasia
B) Metaplasia
C) Hyperplasia
D) Anaplasia
Metaplasia is the reversible replacement of one mature cell type by another mature
cell type, usually in response to chronic irritation or inflammation. Smoking triggers
this shift from fragile columnar cells to durable squamous cells. Dysplasia represents
disordered cell growth and is a pre-cancerous state.
2. A client experiences severe skeletal muscle ischemia due to an arterial occlusion. As
the cell runs out of oxygen, mitochondrial ATP production drops. Which of the
following consequences will occur first as a direct result of the failure of the Na+/K+-
ATPase pump?
A) Intracellular potassium accumulation
B) Intracellular sodium accumulation and cellular swelling
C) Cellular shrinkage and dehydration
, D) Immediate rupture of the cell wall matrix
Without ATP, the active transport sodium-potassium pump fails. Sodium ions rapidly
accumulate inside the cytoplasm, pulling water in by osmosis. This leads to acute
cellular swelling, a hallmark of reversible ischemic injury.
3. During an autopsy, the pathologist identifies an area of necrotic tissue in the brain
that has completely dissolved, transforming into a soft, liquid mass encapsulated by
a cyst. The clinician should recognize this as which pattern of cell death?
A) Coagulative necrosis
B) Caseous necrosis
C) Liquefactive necrosis
D) Fat necrosis
Liquefactive necrosis is highly characteristic of ischemic injury in the brain and
central nervous system. Because brain tissue contains high amounts of lipids and
hydrolytic enzymes, the dead tissue is rapidly digested into a fluid state.
4. A 28-year-old female presents to the fertility clinic for an evaluation. Genetic testing
reveals a karyotype of 45, X. Which of the following physical assessment findings
aligns with this genetic configuration?
A) Tall stature and gynecomastia
B) Short stature, webbed neck, and primary amenorrhea
C) Severe cognitive delay and microcephaly
D) Distended abdominal veins and hepatomegaly
A 45, X karyotype indicates Turner syndrome, which is a complete or partial
monosomy of the X chromosome in females. Classic features include short stature, a
webbed neck, a low posterior hairline, and primary amenorrhea.
5. A clinician is providing genetic counseling to a family with a history of Huntington's
disease, an autosomal dominant disorder. The father is heterozygous for the
, mutation, and the mother does not carry the gene. What is the probability that their
child will inherit the condition?
A) 25%
B) 50%
C) 75%
D) 100%
In autosomal dominant conditions, inheriting a single copy of the mutated gene
causes the disorder. A heterozygous father has a 50% chance of passing the
mutated allele to each offspring.
6. Which statement accurately describes an epigenetic mechanism that affects gene
expression without altering the primary sequence of DNA base pairs?
A) Base-pair substitution inside an exon
B) Frame-shift insertion during meiosis
C) DNA methylation and histone acetylation
D) Chromosomal translocation on autosomes
Epigenetics involves modifications that turn genes "on" or "off" without altering the
underlying DNA sequence. The primary mechanisms are DNA methylation (which
typically silences genes) and histone modification.
7. A pediatric client presents with facial dysmorphisms, including an elongated face, a
prominent jaw, large protruding ears, and macroorchidism. The clinician suspects
Fragile X syndrome. What is the underlying genetic mechanism of this condition?
A) Chromosomal nondisjunction
B) A triplet repeat expansion (CGG repeat)
C) A microdeletion on chromosome 22
D) Autosomal recessive point mutation
, Fragile X syndrome is caused by a triplet repeat expansion of the CGG sequence
on the FMR1 gene located on the X chromosome, leading to gene silencing.
8. An ultra-marathon runner collapses from heat exhaustion. Their cellular biology is
affected by oxidative stress. Which statement describes the mechanism by which
reactive oxygen species (ROS) induce irreversible cell damage?
A) Increasing the pH of the cellular cytoplasm
B) Causing lipid peroxidation of membranes and DNA fragmentation
C) Promoting rapid ATP synthesis via glycolysis
D) Stabilizing the mitochondrial envelope matrix
ROS are unstable molecules that cause oxidative stress, damaging cells by
attacking unsaturated fatty acids in cell membranes (lipid peroxidation), mutating
DNA, and fragmenting proteins.
9. A tissue sample from a client's cervical biopsy reveals irregular, disordered growth
with variations in cell size, shape, and a high mitotic index. The pathologist notes
that the basement membrane is intact. This is classified as:
A) Metaplasia
B) Dysplasia
C) Hypertrophy
D) Atrophy
Dysplasia represents atypical, disordered growth and alteration of mature epithelial
cells. It is a pre-cancerous condition that can advance to carcinoma in situ if the
baseline stressor persists.
10. A client is diagnosed with alpha-1 antitrypsin deficiency, an autosomal codominant
disorder. The clinician understands that the accumulation of misfolded proteins
within which organ is responsible for the hepatic clinical manifestations?
A) Endoplasmic reticulum of hepatocytes
Assessment (OA) | 2026 Edition Complete 116
Questions & Answers
Unit 1: Cellular Dynamics, Injury, and Genetic Pathology
1. A nurse practitioner is reviewing a pathology report for a client with a history of
chronic cigarette smoking. The report indicates that the normal ciliated columnar
epithelial cells of the respiratory tract have been replaced by stratified squamous
epithelial cells. How should the clinician document this reversible alteration?
A) Dysplasia
B) Metaplasia
C) Hyperplasia
D) Anaplasia
Metaplasia is the reversible replacement of one mature cell type by another mature
cell type, usually in response to chronic irritation or inflammation. Smoking triggers
this shift from fragile columnar cells to durable squamous cells. Dysplasia represents
disordered cell growth and is a pre-cancerous state.
2. A client experiences severe skeletal muscle ischemia due to an arterial occlusion. As
the cell runs out of oxygen, mitochondrial ATP production drops. Which of the
following consequences will occur first as a direct result of the failure of the Na+/K+-
ATPase pump?
A) Intracellular potassium accumulation
B) Intracellular sodium accumulation and cellular swelling
C) Cellular shrinkage and dehydration
, D) Immediate rupture of the cell wall matrix
Without ATP, the active transport sodium-potassium pump fails. Sodium ions rapidly
accumulate inside the cytoplasm, pulling water in by osmosis. This leads to acute
cellular swelling, a hallmark of reversible ischemic injury.
3. During an autopsy, the pathologist identifies an area of necrotic tissue in the brain
that has completely dissolved, transforming into a soft, liquid mass encapsulated by
a cyst. The clinician should recognize this as which pattern of cell death?
A) Coagulative necrosis
B) Caseous necrosis
C) Liquefactive necrosis
D) Fat necrosis
Liquefactive necrosis is highly characteristic of ischemic injury in the brain and
central nervous system. Because brain tissue contains high amounts of lipids and
hydrolytic enzymes, the dead tissue is rapidly digested into a fluid state.
4. A 28-year-old female presents to the fertility clinic for an evaluation. Genetic testing
reveals a karyotype of 45, X. Which of the following physical assessment findings
aligns with this genetic configuration?
A) Tall stature and gynecomastia
B) Short stature, webbed neck, and primary amenorrhea
C) Severe cognitive delay and microcephaly
D) Distended abdominal veins and hepatomegaly
A 45, X karyotype indicates Turner syndrome, which is a complete or partial
monosomy of the X chromosome in females. Classic features include short stature, a
webbed neck, a low posterior hairline, and primary amenorrhea.
5. A clinician is providing genetic counseling to a family with a history of Huntington's
disease, an autosomal dominant disorder. The father is heterozygous for the
, mutation, and the mother does not carry the gene. What is the probability that their
child will inherit the condition?
A) 25%
B) 50%
C) 75%
D) 100%
In autosomal dominant conditions, inheriting a single copy of the mutated gene
causes the disorder. A heterozygous father has a 50% chance of passing the
mutated allele to each offspring.
6. Which statement accurately describes an epigenetic mechanism that affects gene
expression without altering the primary sequence of DNA base pairs?
A) Base-pair substitution inside an exon
B) Frame-shift insertion during meiosis
C) DNA methylation and histone acetylation
D) Chromosomal translocation on autosomes
Epigenetics involves modifications that turn genes "on" or "off" without altering the
underlying DNA sequence. The primary mechanisms are DNA methylation (which
typically silences genes) and histone modification.
7. A pediatric client presents with facial dysmorphisms, including an elongated face, a
prominent jaw, large protruding ears, and macroorchidism. The clinician suspects
Fragile X syndrome. What is the underlying genetic mechanism of this condition?
A) Chromosomal nondisjunction
B) A triplet repeat expansion (CGG repeat)
C) A microdeletion on chromosome 22
D) Autosomal recessive point mutation
, Fragile X syndrome is caused by a triplet repeat expansion of the CGG sequence
on the FMR1 gene located on the X chromosome, leading to gene silencing.
8. An ultra-marathon runner collapses from heat exhaustion. Their cellular biology is
affected by oxidative stress. Which statement describes the mechanism by which
reactive oxygen species (ROS) induce irreversible cell damage?
A) Increasing the pH of the cellular cytoplasm
B) Causing lipid peroxidation of membranes and DNA fragmentation
C) Promoting rapid ATP synthesis via glycolysis
D) Stabilizing the mitochondrial envelope matrix
ROS are unstable molecules that cause oxidative stress, damaging cells by
attacking unsaturated fatty acids in cell membranes (lipid peroxidation), mutating
DNA, and fragmenting proteins.
9. A tissue sample from a client's cervical biopsy reveals irregular, disordered growth
with variations in cell size, shape, and a high mitotic index. The pathologist notes
that the basement membrane is intact. This is classified as:
A) Metaplasia
B) Dysplasia
C) Hypertrophy
D) Atrophy
Dysplasia represents atypical, disordered growth and alteration of mature epithelial
cells. It is a pre-cancerous condition that can advance to carcinoma in situ if the
baseline stressor persists.
10. A client is diagnosed with alpha-1 antitrypsin deficiency, an autosomal codominant
disorder. The clinician understands that the accumulation of misfolded proteins
within which organ is responsible for the hepatic clinical manifestations?
A) Endoplasmic reticulum of hepatocytes
