WGU D027 ADVANCED PATHOPHARMACOLOGICAL
FOUNDATIONS FINAL EXAM 2026/2027 | Comprehensive
Study Guide | Verified Answers | Pass Guaranteed - A+
Graded
Section 1: Cellular & Molecular Pathophysiology (Q1-12)
Q1. A patient presents with acute myocardial infarction. The cardiologist explains that
prolonged ischemia has caused irreversible cell injury. Which cellular change is most
characteristic of irreversible hypoxic injury?
A. Cellular swelling with intact plasma membrane
B. Karyolysis and release of cellular enzymes into the extracellular space
C. Decreased intracellular calcium concentration
D. Preservation of mitochondrial structure
Correct Answer: B. Karyolysis and release of cellular enzymes into the extracellular
space [CORRECT]
Rationale: Irreversible hypoxic injury is characterized by nuclear changes (karyolysis,
pyknosis, karyorrhexis) and plasma membrane disruption leading to enzyme leakage.
Options A, C, and D describe reversible injury or incorrect ion shifts.
Q2. A 45-year-old male with chronic alcohol use develops hepatic steatosis. Which
mechanism best explains the accumulation of fat in hepatocytes?
A. Increased beta-oxidation of fatty acids
B. Decreased synthesis of apolipoproteins impairing VLDL export
C. Increased HDL-mediated cholesterol clearance
D. Enhanced mitochondrial ATP production
Correct Answer: B. Decreased synthesis of apolipoproteins impairing VLDL export
[CORRECT]
,Rationale: Alcohol metabolism impairs apolipoprotein synthesis, reducing VLDL
assembly and export from hepatocytes, leading to triglyceride accumulation. Options A,
C, and D describe mechanisms that would reduce, not cause, steatosis.
Q3. A patient with Huntington disease has a CAG trinucleotide repeat expansion in the
HTT gene. Which type of genetic mutation is this?
A. Point mutation
B. Frameshift mutation
C. Dynamic mutation with anticipation
D. Silent mutation
Correct Answer: C. Dynamic mutation with anticipation [CORRECT]
Rationale: Trinucleotide repeat expansions are dynamic mutations that can expand
during gametogenesis, causing earlier onset and more severe disease in successive
generations (anticipation). This is not a point, frameshift, or silent mutation.
Q4. A tumor suppressor gene undergoes hypermethylation of its promoter region.
Which epigenetic consequence occurs?
A. Increased transcription of the gene
B. Gene silencing without alteration of the DNA sequence
C. Activation of oncogenic pathways
D. Increased histone acetylation
Correct Answer: B. Gene silencing without alteration of the DNA sequence [CORRECT]
Rationale: Promoter hypermethylation is an epigenetic modification that silences gene
transcription without changing the DNA sequence. Tumor suppressor silencing
contributes to carcinogenesis. Options A, C, and D describe opposite or unrelated
mechanisms.
,Q5. A cell exposed to radiation undergoes programmed cell death with cell shrinkage,
chromatin condensation, and formation of apoptotic bodies. Which pathway is primarily
activated?
A. Necrosis with ATP depletion
B. Intrinsic (mitochondrial) apoptosis pathway
C. Pyroptosis with IL-1β release
D. Ferroptosis with iron-dependent lipid peroxidation
Correct Answer: B. Intrinsic (mitochondrial) apoptosis pathway [CORRECT]
Rationale: Radiation-induced DNA damage activates the intrinsic apoptosis pathway via
p53, Bax/Bak, cytochrome c release, and caspase activation. The described morphology
(shrinkage, condensation, apoptotic bodies) is classic apoptosis, not necrosis,
pyroptosis, or ferroptosis.
Q6. A patient with cystic fibrosis has a deletion of phenylalanine at position 508
(ΔF508) in the CFTR protein. Which mutation type is this?
A. Nonsense mutation
B. Missense mutation
C. Deletion mutation affecting protein folding
D. Splice site mutation
Correct Answer: C. Deletion mutation affecting protein folding [CORRECT]
Rationale: The ΔF508 mutation is a three-nucleotide deletion causing loss of a
phenylalanine residue, leading to defective CFTR protein folding and premature
degradation. It is not a nonsense, missense, or splice site mutation.
Q7. Oxidative stress causes cellular injury primarily through:
A. Generation of reactive oxygen species (ROS) that damage lipids, proteins, and DNA
B. Increased synthesis of antioxidant enzymes
C. Enhanced mitochondrial membrane potential
D. Decreased calcium influx
, Correct Answer: A. Generation of reactive oxygen species (ROS) that damage lipids,
proteins, and DNA [CORRECT]
Rationale: ROS including superoxide, hydrogen peroxide, and hydroxyl radicals cause
lipid peroxidation, protein oxidation, and DNA strand breaks. Options B, C, and D
describe protective or incorrect mechanisms.
Q8. A signal transduction pathway involves G-protein activation of adenylyl cyclase,
increasing cAMP and activating protein kinase A. Which receptor type initiates this
cascade?
A. Receptor tyrosine kinase
B. G-protein coupled receptor (GPCR)
C. Nuclear hormone receptor
D. Ligand-gated ion channel
Correct Answer: B. G-protein coupled receptor (GPCR) [CORRECT]
Rationale: GPCRs coupled to Gs proteins activate adenylyl cyclase, increasing cAMP
and PKA activity. This is the classic mechanism for β-adrenergic receptors. Receptor
tyrosine kinases, nuclear receptors, and ion channels use different signaling
mechanisms.
Q9. A patient with chronic granulomatous disease has defective NADPH oxidase. Which
cellular function is impaired?
A. Phagosome-lysosome fusion
B. Generation of microbicidal reactive oxygen species in phagocytes
C. Antibody production by B cells
D. T-cell receptor signaling
Correct Answer: B. Generation of microbicidal reactive oxygen species in phagocytes
[CORRECT]
Rationale: NADPH oxidase generates superoxide (respiratory burst) for microbial killing.
Deficiency causes recurrent infections with catalase-positive organisms. Options A, C,
and D describe unrelated immune functions.
FOUNDATIONS FINAL EXAM 2026/2027 | Comprehensive
Study Guide | Verified Answers | Pass Guaranteed - A+
Graded
Section 1: Cellular & Molecular Pathophysiology (Q1-12)
Q1. A patient presents with acute myocardial infarction. The cardiologist explains that
prolonged ischemia has caused irreversible cell injury. Which cellular change is most
characteristic of irreversible hypoxic injury?
A. Cellular swelling with intact plasma membrane
B. Karyolysis and release of cellular enzymes into the extracellular space
C. Decreased intracellular calcium concentration
D. Preservation of mitochondrial structure
Correct Answer: B. Karyolysis and release of cellular enzymes into the extracellular
space [CORRECT]
Rationale: Irreversible hypoxic injury is characterized by nuclear changes (karyolysis,
pyknosis, karyorrhexis) and plasma membrane disruption leading to enzyme leakage.
Options A, C, and D describe reversible injury or incorrect ion shifts.
Q2. A 45-year-old male with chronic alcohol use develops hepatic steatosis. Which
mechanism best explains the accumulation of fat in hepatocytes?
A. Increased beta-oxidation of fatty acids
B. Decreased synthesis of apolipoproteins impairing VLDL export
C. Increased HDL-mediated cholesterol clearance
D. Enhanced mitochondrial ATP production
Correct Answer: B. Decreased synthesis of apolipoproteins impairing VLDL export
[CORRECT]
,Rationale: Alcohol metabolism impairs apolipoprotein synthesis, reducing VLDL
assembly and export from hepatocytes, leading to triglyceride accumulation. Options A,
C, and D describe mechanisms that would reduce, not cause, steatosis.
Q3. A patient with Huntington disease has a CAG trinucleotide repeat expansion in the
HTT gene. Which type of genetic mutation is this?
A. Point mutation
B. Frameshift mutation
C. Dynamic mutation with anticipation
D. Silent mutation
Correct Answer: C. Dynamic mutation with anticipation [CORRECT]
Rationale: Trinucleotide repeat expansions are dynamic mutations that can expand
during gametogenesis, causing earlier onset and more severe disease in successive
generations (anticipation). This is not a point, frameshift, or silent mutation.
Q4. A tumor suppressor gene undergoes hypermethylation of its promoter region.
Which epigenetic consequence occurs?
A. Increased transcription of the gene
B. Gene silencing without alteration of the DNA sequence
C. Activation of oncogenic pathways
D. Increased histone acetylation
Correct Answer: B. Gene silencing without alteration of the DNA sequence [CORRECT]
Rationale: Promoter hypermethylation is an epigenetic modification that silences gene
transcription without changing the DNA sequence. Tumor suppressor silencing
contributes to carcinogenesis. Options A, C, and D describe opposite or unrelated
mechanisms.
,Q5. A cell exposed to radiation undergoes programmed cell death with cell shrinkage,
chromatin condensation, and formation of apoptotic bodies. Which pathway is primarily
activated?
A. Necrosis with ATP depletion
B. Intrinsic (mitochondrial) apoptosis pathway
C. Pyroptosis with IL-1β release
D. Ferroptosis with iron-dependent lipid peroxidation
Correct Answer: B. Intrinsic (mitochondrial) apoptosis pathway [CORRECT]
Rationale: Radiation-induced DNA damage activates the intrinsic apoptosis pathway via
p53, Bax/Bak, cytochrome c release, and caspase activation. The described morphology
(shrinkage, condensation, apoptotic bodies) is classic apoptosis, not necrosis,
pyroptosis, or ferroptosis.
Q6. A patient with cystic fibrosis has a deletion of phenylalanine at position 508
(ΔF508) in the CFTR protein. Which mutation type is this?
A. Nonsense mutation
B. Missense mutation
C. Deletion mutation affecting protein folding
D. Splice site mutation
Correct Answer: C. Deletion mutation affecting protein folding [CORRECT]
Rationale: The ΔF508 mutation is a three-nucleotide deletion causing loss of a
phenylalanine residue, leading to defective CFTR protein folding and premature
degradation. It is not a nonsense, missense, or splice site mutation.
Q7. Oxidative stress causes cellular injury primarily through:
A. Generation of reactive oxygen species (ROS) that damage lipids, proteins, and DNA
B. Increased synthesis of antioxidant enzymes
C. Enhanced mitochondrial membrane potential
D. Decreased calcium influx
, Correct Answer: A. Generation of reactive oxygen species (ROS) that damage lipids,
proteins, and DNA [CORRECT]
Rationale: ROS including superoxide, hydrogen peroxide, and hydroxyl radicals cause
lipid peroxidation, protein oxidation, and DNA strand breaks. Options B, C, and D
describe protective or incorrect mechanisms.
Q8. A signal transduction pathway involves G-protein activation of adenylyl cyclase,
increasing cAMP and activating protein kinase A. Which receptor type initiates this
cascade?
A. Receptor tyrosine kinase
B. G-protein coupled receptor (GPCR)
C. Nuclear hormone receptor
D. Ligand-gated ion channel
Correct Answer: B. G-protein coupled receptor (GPCR) [CORRECT]
Rationale: GPCRs coupled to Gs proteins activate adenylyl cyclase, increasing cAMP
and PKA activity. This is the classic mechanism for β-adrenergic receptors. Receptor
tyrosine kinases, nuclear receptors, and ion channels use different signaling
mechanisms.
Q9. A patient with chronic granulomatous disease has defective NADPH oxidase. Which
cellular function is impaired?
A. Phagosome-lysosome fusion
B. Generation of microbicidal reactive oxygen species in phagocytes
C. Antibody production by B cells
D. T-cell receptor signaling
Correct Answer: B. Generation of microbicidal reactive oxygen species in phagocytes
[CORRECT]
Rationale: NADPH oxidase generates superoxide (respiratory burst) for microbial killing.
Deficiency causes recurrent infections with catalase-positive organisms. Options A, C,
and D describe unrelated immune functions.
