WALDEN | NURS 6501
OBJECTIVE ASSESSMENT - EXAM
Advanced Pathophysiology
Midterm Exam
NURS 6501 | Walden | 2026/2027
100 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Cellular & Molecular Pathophysiology Neurological & Musculoskeletal Disorders
Cardiovascular & Respiratory Disorders Endocrine & Reproductive Pathology
Renal & Fluid/Electrolyte Imbalances
COVER PAGE - 1
, SECTION 1 | Cellular & Molecular Pathophysiology | Q1-Q20 | NURS 6501 2026/2027
Q1 Question 1 of 100
A 52-year-old man with a 30-pack-year smoking history presents with a persistent cough and weight loss. Bronchoscopy reveals a
central lung mass composed of small cells with scant cytoplasm. Which of the following molecular events is most characteristic of
this tumor's aggressive behavior?
A. A. Inactivation of the p53 and Rb tumor suppressor genes
B. B. Overexpression of the HER2 receptor
C. C. Mutation in the APC gene leading to Wnt pathway activation
D. D. Translocation resulting in BCR-ABL fusion protein
Correct Answer: A
Rationale:
Small cell lung cancer is strongly linked to smoking and features biallelic inactivation of p53 and Rb, driving rapid proliferation and early metastasis. HER2 is typical of breast
cancer. APC is colorectal. BCR-ABL defines CML.
Q2 Question 2 of 100
A 38-year-old woman develops acute pancreatitis after an episode of heavy alcohol consumption. Which of the following cellular
processes is primarily responsible for the autodigestion of pancreatic tissue?
A. A. Release of activated digestive enzymes from acinar cells causing necrosis
B. B. Apoptosis of beta cells due to autoimmune attack
C. C. Accumulation of lipid droplets within hepatocytes
D. D. Hyperplasia of ductal epithelial cells
Correct Answer: A
Rationale:
Alcohol triggers premature activation of trypsinogen to trypsin within acinar cells, leading to autodigestion and coagulative necrosis of the pancreas. This is not apoptosis of beta
cells (type 1 diabetes) or steatosis (liver).
Q3 Question 3 of 100
A newborn is diagnosed with cystic fibrosis after presenting with meconium ileus. Which of the following is the underlying molecular
defect responsible for the thick mucus secretions?
A. A. Defective CFTR protein causing impaired chloride transport
B. B. Mutation in the alpha-1 antitrypsin gene
C. C. Deficiency of glucose-6-phosphatase
D. D. Trinucleotide repeat expansion in the HTT gene
Correct Answer: A
Rationale:
Cystic fibrosis is caused by mutations in the CFTR gene, resulting in defective chloride channel function, thick mucus, and recurrent infections. Alpha-1 antitrypsin is
emphysema/liver disease. G6Pase is Von Gierke. HTT is Huntington.
NURS 6501 — 2026/2027 | Passing Score: 80% | Page 2 of 2
, Q4 Question 4 of 100
A 45-year-old man presents with fatigue and is found to have a hemoglobin of 9.8 g/dL with MCV of 105 fL. Bone marrow shows
megaloblastic changes. Which of the following is the most likely mechanism?
A. A. Impaired DNA synthesis due to folate or B12 deficiency
B. B. Decreased hemoglobin production from iron deficiency
C. C. Increased red cell destruction from G6PD deficiency
D. D. Extravascular hemolysis from spherocytosis
Correct Answer: A
Rationale:
Megaloblastic anemia results from impaired DNA synthesis secondary to B12 or folate deficiency, leading to large, immature RBC precursors. Iron deficiency is microcytic. G6PD
and hereditary spherocytosis cause hemolytic (normocytic) anemia.
Q5 Question 5 of 100
During inflammation, which of the following mediators is primarily responsible for the increased vascular permeability seen in the
early phase?
A. A. Histamine released from mast cells and basophils
B. B. Interleukin-1 produced by macrophages
C. C. Tumor necrosis factor from T lymphocytes
D. D. Complement C5a acting on neutrophils
Correct Answer: A
Rationale:
Histamine causes immediate vasodilation and increased permeability (wheal-and-flare). IL-1 and TNF are later mediators of fever and acute phase response. C5a is a chemotactic
factor.
Q6 Question 6 of 100
A 60-year-old woman with a history of breast cancer develops multiple osteolytic bone lesions. Which of the following paraneoplastic
mechanisms is most likely?
A. A. Tumor secretion of PTH-related peptide stimulating osteoclasts
B. B. Direct bone invasion by metastatic carcinoma cells
C. C. Overproduction of erythropoietin by tumor cells
D. D. Autoimmune destruction of osteoblasts
Correct Answer: A
Rationale:
Many solid tumors (breast, lung, kidney) secrete PTHrP causing hypercalcemia of malignancy via osteoclast activation. Direct invasion occurs but PTHrP is the humoral
mechanism. EPO causes polycythemia. Osteoblast destruction is not typical.
Q7 Question 7 of 100
A researcher is studying apoptosis. Which of the following proteins is the key executioner caspase that cleaves cellular proteins
during programmed cell death?
A. A. Caspase-3
B. B. Bcl-2
C. C. Bax
D. D. Cytochrome c
Correct Answer: A
Rationale:
Caspase-3 is the main effector caspase that executes apoptosis by cleaving substrates. Bcl-2 is anti-apoptotic. Bax is pro-apoptotic (mitochondrial). Cytochrome c is released to
activate the apoptosome.
NURS 6501 — 2026/2027 | Passing Score: 80% | Page 3 of 3
OBJECTIVE ASSESSMENT - EXAM
Advanced Pathophysiology
Midterm Exam
NURS 6501 | Walden | 2026/2027
100 100% 2026/2027
QUESTIONS VERIFIED ANSWERS EDITION
TOPICS COVERED
Cellular & Molecular Pathophysiology Neurological & Musculoskeletal Disorders
Cardiovascular & Respiratory Disorders Endocrine & Reproductive Pathology
Renal & Fluid/Electrolyte Imbalances
COVER PAGE - 1
, SECTION 1 | Cellular & Molecular Pathophysiology | Q1-Q20 | NURS 6501 2026/2027
Q1 Question 1 of 100
A 52-year-old man with a 30-pack-year smoking history presents with a persistent cough and weight loss. Bronchoscopy reveals a
central lung mass composed of small cells with scant cytoplasm. Which of the following molecular events is most characteristic of
this tumor's aggressive behavior?
A. A. Inactivation of the p53 and Rb tumor suppressor genes
B. B. Overexpression of the HER2 receptor
C. C. Mutation in the APC gene leading to Wnt pathway activation
D. D. Translocation resulting in BCR-ABL fusion protein
Correct Answer: A
Rationale:
Small cell lung cancer is strongly linked to smoking and features biallelic inactivation of p53 and Rb, driving rapid proliferation and early metastasis. HER2 is typical of breast
cancer. APC is colorectal. BCR-ABL defines CML.
Q2 Question 2 of 100
A 38-year-old woman develops acute pancreatitis after an episode of heavy alcohol consumption. Which of the following cellular
processes is primarily responsible for the autodigestion of pancreatic tissue?
A. A. Release of activated digestive enzymes from acinar cells causing necrosis
B. B. Apoptosis of beta cells due to autoimmune attack
C. C. Accumulation of lipid droplets within hepatocytes
D. D. Hyperplasia of ductal epithelial cells
Correct Answer: A
Rationale:
Alcohol triggers premature activation of trypsinogen to trypsin within acinar cells, leading to autodigestion and coagulative necrosis of the pancreas. This is not apoptosis of beta
cells (type 1 diabetes) or steatosis (liver).
Q3 Question 3 of 100
A newborn is diagnosed with cystic fibrosis after presenting with meconium ileus. Which of the following is the underlying molecular
defect responsible for the thick mucus secretions?
A. A. Defective CFTR protein causing impaired chloride transport
B. B. Mutation in the alpha-1 antitrypsin gene
C. C. Deficiency of glucose-6-phosphatase
D. D. Trinucleotide repeat expansion in the HTT gene
Correct Answer: A
Rationale:
Cystic fibrosis is caused by mutations in the CFTR gene, resulting in defective chloride channel function, thick mucus, and recurrent infections. Alpha-1 antitrypsin is
emphysema/liver disease. G6Pase is Von Gierke. HTT is Huntington.
NURS 6501 — 2026/2027 | Passing Score: 80% | Page 2 of 2
, Q4 Question 4 of 100
A 45-year-old man presents with fatigue and is found to have a hemoglobin of 9.8 g/dL with MCV of 105 fL. Bone marrow shows
megaloblastic changes. Which of the following is the most likely mechanism?
A. A. Impaired DNA synthesis due to folate or B12 deficiency
B. B. Decreased hemoglobin production from iron deficiency
C. C. Increased red cell destruction from G6PD deficiency
D. D. Extravascular hemolysis from spherocytosis
Correct Answer: A
Rationale:
Megaloblastic anemia results from impaired DNA synthesis secondary to B12 or folate deficiency, leading to large, immature RBC precursors. Iron deficiency is microcytic. G6PD
and hereditary spherocytosis cause hemolytic (normocytic) anemia.
Q5 Question 5 of 100
During inflammation, which of the following mediators is primarily responsible for the increased vascular permeability seen in the
early phase?
A. A. Histamine released from mast cells and basophils
B. B. Interleukin-1 produced by macrophages
C. C. Tumor necrosis factor from T lymphocytes
D. D. Complement C5a acting on neutrophils
Correct Answer: A
Rationale:
Histamine causes immediate vasodilation and increased permeability (wheal-and-flare). IL-1 and TNF are later mediators of fever and acute phase response. C5a is a chemotactic
factor.
Q6 Question 6 of 100
A 60-year-old woman with a history of breast cancer develops multiple osteolytic bone lesions. Which of the following paraneoplastic
mechanisms is most likely?
A. A. Tumor secretion of PTH-related peptide stimulating osteoclasts
B. B. Direct bone invasion by metastatic carcinoma cells
C. C. Overproduction of erythropoietin by tumor cells
D. D. Autoimmune destruction of osteoblasts
Correct Answer: A
Rationale:
Many solid tumors (breast, lung, kidney) secrete PTHrP causing hypercalcemia of malignancy via osteoclast activation. Direct invasion occurs but PTHrP is the humoral
mechanism. EPO causes polycythemia. Osteoblast destruction is not typical.
Q7 Question 7 of 100
A researcher is studying apoptosis. Which of the following proteins is the key executioner caspase that cleaves cellular proteins
during programmed cell death?
A. A. Caspase-3
B. B. Bcl-2
C. C. Bax
D. D. Cytochrome c
Correct Answer: A
Rationale:
Caspase-3 is the main effector caspase that executes apoptosis by cleaving substrates. Bcl-2 is anti-apoptotic. Bax is pro-apoptotic (mitochondrial). Cytochrome c is released to
activate the apoptosome.
NURS 6501 — 2026/2027 | Passing Score: 80% | Page 3 of 3
