WGU D236 PATHOPHYSIOLOGY EXAM ACTUAL 2026/2027 |
Questions & Verified Answers | Grade A | Complete Exam
Review | Pass Guaranteed - A+ Graded
Section 1: Cellular & Genetic Mechanisms
Q1: A 58-year-old smoker presents with a persistent cough and hemoptysis. Biopsy
reveals squamous cell carcinoma with keratin pearls. Which cellular adaptation process
failed to prevent this malignant transformation?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia [CORRECT]
D. Dysplasia
Correct Answer: C
Rationale: The best answer is metaplasia. In the respiratory tract, chronic irritation from
smoking triggers metaplasia—where normal columnar epithelium transforms into
squamous epithelium to better withstand the insult. That's right because metaplasia is a
reversible adaptation, but if the irritation continues, it can progress through dysplasia to
carcinoma. Remember that this patient's keratin pearls are classic for well-differentiated
squamous cell carcinoma, which often arises from areas of previous metaplasia in the
bronchi.
,Q2: A patient receives chemotherapy that targets rapidly dividing cells. Which phase of
the cell cycle is most affected by drugs that inhibit DNA synthesis?
A. G0 phase
B. G1 phase
C. S phase [CORRECT]
D. M phase
Correct Answer: C
Rationale: That's right because the S phase is when DNA replication occurs—making it
the prime target for antimetabolite chemotherapy drugs. These agents work by
interfering with the synthesis of new DNA strands, which only happens during S phase.
Remember that cells in G0 (Option A) aren't dividing, so they're relatively protected; G1 is
for cell growth preparation; and M phase (Option D) drugs affect mitosis directly, not
DNA synthesis.
Q3: A newborn has cystic fibrosis despite no family history. Genetic testing reveals a
deletion of three nucleotides (ΔF508). What type of mutation is this?
A. Missense mutation
B. Nonsense mutation
C. Frameshift mutation
D. In-frame deletion [CORRECT]
Correct Answer: D
,Rationale: The best answer is in-frame deletion. That's right because deleting exactly
three nucleotides (one codon) removes a single amino acid without shifting the reading
frame—so the protein can still be synthesized, just with impaired function. This matches
what you see with ΔF508 in CFTR, where the protein misfolds and gets degraded.
Remember that frameshift mutations (Option C) involve insertions or deletions not
divisible by three, which completely alter downstream amino acids.
Q4: A 45-year-old woman has bilateral breast cancer at a young age. Her mother and
sister also had breast cancer. Which genetic mechanism best explains this familial
pattern?
A. Spontaneous mutation in somatic cells
B. Germline mutation in BRCA1 or BRCA2 [CORRECT]
C. Epigenetic silencing of tumor suppressor genes
D. Chromosomal translocation
Correct Answer: B
Rationale: That's right because germline mutations in BRCA1 or BRCA2 are inherited
through the germline (egg or sperm), explaining the vertical transmission pattern
through multiple generations. These are tumor suppressor genes involved in DNA repair.
Remember that somatic mutations (Option A) aren't inherited; epigenetic changes
(Option C) can be heritable but less commonly cause this strong familial pattern; and
translocations (Option D) are more typical of leukemias.
Q5: A cell exposed to radiation shows DNA damage but repairs it successfully. If repair
fails, which intracellular process would eliminate the damaged cell?
, A. Necrosis
B. Apoptosis [CORRECT]
C. Autophagy
D. Senescence
Correct Answer: B
Rationale: The best answer is apoptosis. That's right because programmed cell death is
the body's quality control mechanism—when DNA damage is too severe to repair, p53
and other proteins trigger apoptosis to prevent potentially cancerous cells from
surviving. Remember that necrosis (Option A) is unprogrammed cell death from acute
injury; autophagy (Option C) recycles cellular components; and senescence (Option D)
arrests the cell cycle but doesn't eliminate the cell.
Q6: A tumor biopsy shows cells with high nuclear-to-cytoplasmic ratios, prominent
nucleoli, and numerous mitotic figures. Which characteristic of malignancy is
demonstrated?
A. Differentiation
B. Anaplasia [CORRECT]
C. Metaplasia
D. Hyperplasia
Correct Answer: B
Rationale: That's right because anaplasia refers to the loss of cellular differentiation and
organization seen in malignant tumors—exactly what you're seeing with those high
Questions & Verified Answers | Grade A | Complete Exam
Review | Pass Guaranteed - A+ Graded
Section 1: Cellular & Genetic Mechanisms
Q1: A 58-year-old smoker presents with a persistent cough and hemoptysis. Biopsy
reveals squamous cell carcinoma with keratin pearls. Which cellular adaptation process
failed to prevent this malignant transformation?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia [CORRECT]
D. Dysplasia
Correct Answer: C
Rationale: The best answer is metaplasia. In the respiratory tract, chronic irritation from
smoking triggers metaplasia—where normal columnar epithelium transforms into
squamous epithelium to better withstand the insult. That's right because metaplasia is a
reversible adaptation, but if the irritation continues, it can progress through dysplasia to
carcinoma. Remember that this patient's keratin pearls are classic for well-differentiated
squamous cell carcinoma, which often arises from areas of previous metaplasia in the
bronchi.
,Q2: A patient receives chemotherapy that targets rapidly dividing cells. Which phase of
the cell cycle is most affected by drugs that inhibit DNA synthesis?
A. G0 phase
B. G1 phase
C. S phase [CORRECT]
D. M phase
Correct Answer: C
Rationale: That's right because the S phase is when DNA replication occurs—making it
the prime target for antimetabolite chemotherapy drugs. These agents work by
interfering with the synthesis of new DNA strands, which only happens during S phase.
Remember that cells in G0 (Option A) aren't dividing, so they're relatively protected; G1 is
for cell growth preparation; and M phase (Option D) drugs affect mitosis directly, not
DNA synthesis.
Q3: A newborn has cystic fibrosis despite no family history. Genetic testing reveals a
deletion of three nucleotides (ΔF508). What type of mutation is this?
A. Missense mutation
B. Nonsense mutation
C. Frameshift mutation
D. In-frame deletion [CORRECT]
Correct Answer: D
,Rationale: The best answer is in-frame deletion. That's right because deleting exactly
three nucleotides (one codon) removes a single amino acid without shifting the reading
frame—so the protein can still be synthesized, just with impaired function. This matches
what you see with ΔF508 in CFTR, where the protein misfolds and gets degraded.
Remember that frameshift mutations (Option C) involve insertions or deletions not
divisible by three, which completely alter downstream amino acids.
Q4: A 45-year-old woman has bilateral breast cancer at a young age. Her mother and
sister also had breast cancer. Which genetic mechanism best explains this familial
pattern?
A. Spontaneous mutation in somatic cells
B. Germline mutation in BRCA1 or BRCA2 [CORRECT]
C. Epigenetic silencing of tumor suppressor genes
D. Chromosomal translocation
Correct Answer: B
Rationale: That's right because germline mutations in BRCA1 or BRCA2 are inherited
through the germline (egg or sperm), explaining the vertical transmission pattern
through multiple generations. These are tumor suppressor genes involved in DNA repair.
Remember that somatic mutations (Option A) aren't inherited; epigenetic changes
(Option C) can be heritable but less commonly cause this strong familial pattern; and
translocations (Option D) are more typical of leukemias.
Q5: A cell exposed to radiation shows DNA damage but repairs it successfully. If repair
fails, which intracellular process would eliminate the damaged cell?
, A. Necrosis
B. Apoptosis [CORRECT]
C. Autophagy
D. Senescence
Correct Answer: B
Rationale: The best answer is apoptosis. That's right because programmed cell death is
the body's quality control mechanism—when DNA damage is too severe to repair, p53
and other proteins trigger apoptosis to prevent potentially cancerous cells from
surviving. Remember that necrosis (Option A) is unprogrammed cell death from acute
injury; autophagy (Option C) recycles cellular components; and senescence (Option D)
arrests the cell cycle but doesn't eliminate the cell.
Q6: A tumor biopsy shows cells with high nuclear-to-cytoplasmic ratios, prominent
nucleoli, and numerous mitotic figures. Which characteristic of malignancy is
demonstrated?
A. Differentiation
B. Anaplasia [CORRECT]
C. Metaplasia
D. Hyperplasia
Correct Answer: B
Rationale: That's right because anaplasia refers to the loss of cellular differentiation and
organization seen in malignant tumors—exactly what you're seeing with those high
