WGU D115 ADVANCED PATHOPHYSIOLOGY
FOR THE ADVANCED PRACTICE NURSE EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS
WITH RATIONALES 100% GUARANTEED PASS!!
<LATEST VERSION>
1. A 34-year-old woman has recurrent episodes of hemolytic anemia after
receiving a specific medication. Genetic testing identifies a single nucleotide
substitution that changes one amino acid in the β-globin protein. Which type of
mutation is most consistent with this finding?
A. Nonsense mutation
B. Missense mutation
C. Frameshift mutation
D. Silent mutation
Answer: B
Rationale: A missense mutation results from a nucleotide substitution that changes
one codon and produces a different amino acid in the resulting protein. A nonsense
mutation creates a premature stop codon, a frameshift results from insertion or
deletion of nucleotides that alters the reading frame, and a silent mutation does not
change the encoded amino acid.
,2. A patient with longstanding hypertension develops increased left ventricular
wall thickness. Which cellular adaptation best explains this structural change?
A. Atrophy caused by decreased workload
B. Hyperplasia caused by increased cell division
C. Hypertrophy caused by increased workload
D. Metaplasia caused by chronic irritation
Answer: C
Rationale: Cardiac myocytes have limited ability to divide, so chronic pressure
overload causes enlargement of individual cells, producing hypertrophy.
Hyperplasia refers to an increase in cell number and is not the typical adaptive
response of cardiac muscle to hypertension.
3. A patient develops wheezing, urticaria, hypotension, and facial swelling minutes
after receiving an intravenous medication. Which immunologic mechanism is
primarily responsible?
A. IgG-mediated immune complex deposition
B. Cytotoxic T-cell activation
C. IgE-mediated mast-cell degranulation
D. IgG-mediated complement inhibition
Answer: C
Rationale: Type I hypersensitivity is an immediate reaction mediated by allergen-
specific IgE. Cross-linking of IgE on mast cells triggers release of histamine and
other mediators, producing bronchoconstriction, vasodilation, increased vascular
permeability, and edema.
,4. A newborn has short stature, webbed neck, widely spaced nipples, and ovarian
dysgenesis. Which chromosomal abnormality should the clinician expect?
A. 47,XXY
B. 47,XY,+21
C. 45,X
D. 46,XX
Answer: C
Rationale: Turner syndrome is associated with monosomy X, written as 45,X.
Typical findings include short stature, webbed neck, gonadal dysgenesis, and
infertility. Klinefelter syndrome is generally 47,XXY.
5. A patient with severe diarrhea has the following arterial blood gas results:
pH 7.28
PaCO₂ 31 mm Hg
HCO₃⁻ 15 mEq/L
Which interpretation is most accurate?
A. Uncompensated respiratory acidosis
B. Metabolic acidosis with respiratory compensation
C. Metabolic alkalosis with respiratory compensation
D. Respiratory alkalosis with metabolic compensation
Answer: B
Rationale: The low pH indicates acidemia, and the markedly decreased
bicarbonate identifies a primary metabolic acidosis. The decreased PaCO₂ indicates
compensatory hyperventilation. Diarrhea commonly causes bicarbonate loss from
the gastrointestinal tract.
, 6. A 59-year-old patient with crushing substernal chest pain has an elevated
troponin level. Within hours, damaged myocardial cells show irreversible
membrane injury, calcium influx, and loss of ATP-dependent processes. Which
type of cell death is most likely occurring?
A. Apoptosis
B. Necrosis
C. Autophagy
D. Hypertrophy
Answer: B
Rationale: Ischemic myocardial injury causes necrosis, characterized by loss of
membrane integrity, cellular swelling, inflammation, and leakage of intracellular
contents. Apoptosis is a regulated form of cell death that generally does not
produce the same degree of inflammation.
7. A patient with myasthenia gravis reports increasing difficulty chewing late in the
day. Muscle strength improves after rest. Which mechanism best explains the
disorder?
A. Destruction of dopamine-producing neurons
B. Autoantibodies targeting postsynaptic acetylcholine receptors
C. Excess release of acetylcholine from presynaptic neurons
D. Demyelination of sensory neurons
Answer: B
FOR THE ADVANCED PRACTICE NURSE EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS
WITH RATIONALES 100% GUARANTEED PASS!!
<LATEST VERSION>
1. A 34-year-old woman has recurrent episodes of hemolytic anemia after
receiving a specific medication. Genetic testing identifies a single nucleotide
substitution that changes one amino acid in the β-globin protein. Which type of
mutation is most consistent with this finding?
A. Nonsense mutation
B. Missense mutation
C. Frameshift mutation
D. Silent mutation
Answer: B
Rationale: A missense mutation results from a nucleotide substitution that changes
one codon and produces a different amino acid in the resulting protein. A nonsense
mutation creates a premature stop codon, a frameshift results from insertion or
deletion of nucleotides that alters the reading frame, and a silent mutation does not
change the encoded amino acid.
,2. A patient with longstanding hypertension develops increased left ventricular
wall thickness. Which cellular adaptation best explains this structural change?
A. Atrophy caused by decreased workload
B. Hyperplasia caused by increased cell division
C. Hypertrophy caused by increased workload
D. Metaplasia caused by chronic irritation
Answer: C
Rationale: Cardiac myocytes have limited ability to divide, so chronic pressure
overload causes enlargement of individual cells, producing hypertrophy.
Hyperplasia refers to an increase in cell number and is not the typical adaptive
response of cardiac muscle to hypertension.
3. A patient develops wheezing, urticaria, hypotension, and facial swelling minutes
after receiving an intravenous medication. Which immunologic mechanism is
primarily responsible?
A. IgG-mediated immune complex deposition
B. Cytotoxic T-cell activation
C. IgE-mediated mast-cell degranulation
D. IgG-mediated complement inhibition
Answer: C
Rationale: Type I hypersensitivity is an immediate reaction mediated by allergen-
specific IgE. Cross-linking of IgE on mast cells triggers release of histamine and
other mediators, producing bronchoconstriction, vasodilation, increased vascular
permeability, and edema.
,4. A newborn has short stature, webbed neck, widely spaced nipples, and ovarian
dysgenesis. Which chromosomal abnormality should the clinician expect?
A. 47,XXY
B. 47,XY,+21
C. 45,X
D. 46,XX
Answer: C
Rationale: Turner syndrome is associated with monosomy X, written as 45,X.
Typical findings include short stature, webbed neck, gonadal dysgenesis, and
infertility. Klinefelter syndrome is generally 47,XXY.
5. A patient with severe diarrhea has the following arterial blood gas results:
pH 7.28
PaCO₂ 31 mm Hg
HCO₃⁻ 15 mEq/L
Which interpretation is most accurate?
A. Uncompensated respiratory acidosis
B. Metabolic acidosis with respiratory compensation
C. Metabolic alkalosis with respiratory compensation
D. Respiratory alkalosis with metabolic compensation
Answer: B
Rationale: The low pH indicates acidemia, and the markedly decreased
bicarbonate identifies a primary metabolic acidosis. The decreased PaCO₂ indicates
compensatory hyperventilation. Diarrhea commonly causes bicarbonate loss from
the gastrointestinal tract.
, 6. A 59-year-old patient with crushing substernal chest pain has an elevated
troponin level. Within hours, damaged myocardial cells show irreversible
membrane injury, calcium influx, and loss of ATP-dependent processes. Which
type of cell death is most likely occurring?
A. Apoptosis
B. Necrosis
C. Autophagy
D. Hypertrophy
Answer: B
Rationale: Ischemic myocardial injury causes necrosis, characterized by loss of
membrane integrity, cellular swelling, inflammation, and leakage of intracellular
contents. Apoptosis is a regulated form of cell death that generally does not
produce the same degree of inflammation.
7. A patient with myasthenia gravis reports increasing difficulty chewing late in the
day. Muscle strength improves after rest. Which mechanism best explains the
disorder?
A. Destruction of dopamine-producing neurons
B. Autoantibodies targeting postsynaptic acetylcholine receptors
C. Excess release of acetylcholine from presynaptic neurons
D. Demyelination of sensory neurons
Answer: B
