NR 507 Final Exam 2026 | Advanced Pathophysiology |
Chamberlain University | Comprehensive Practice Examination |
High-Yield Questions, Answers & Detailed Rationales
Question 1
A 45-year-old patient presents with fatigue, pallor, and shortness of
breath. Laboratory findings reveal macrocytic anemia with
hypersegmented neutrophils. Which cellular mechanism is most likely
impaired in this patient?
A. Iron storage in ferritin complexes
B. DNA synthesis due to vitamin B12 deficiency
C. Hemoglobin chain assembly in erythrocytes
D. Erythropoietin receptor signaling pathway
Correct Answer: B
Explanation: Vitamin B12 deficiency impairs DNA synthesis, causing
megaloblastic anemia characterized by macrocytic erythrocytes and
hypersegmented neutrophils due to ineffective hematopoiesis.
Question 2
A researcher is studying a cell line that demonstrates uncontrolled
proliferation despite contact inhibition signals. Which cellular component
is most likely defective in these cells?
,A. Mitochondrial membrane potential
B. Golgi apparatus protein processing
C. Tumor suppressor gene p53 function
D. Ribosomal protein synthesis
Correct Answer: C
Explanation: p53 is a critical tumor suppressor protein that regulates cell
cycle arrest and apoptosis. Defective p53 allows uncontrolled proliferation
even with contact inhibition signals.
Question 3
During hypoxia, a cell shifts from oxidative phosphorylation to anaerobic
glycolysis. Which ion imbalance would most likely occur as a consequence
of this metabolic shift?
A. Increased intracellular calcium
B. Decreased intracellular sodium
C. Increased intracellular potassium
D. Decreased intracellular hydrogen
Correct Answer: A
,Explanation: Anaerobic glycolysis produces lactic acid, lowering pH and
impairing membrane pumps. The sodium-potassium pump fails, leading to
increased intracellular sodium and calcium accumulation.
Question 4
A 32-year-old woman with a known BRCA1 mutation develops breast
cancer. Which cellular process is directly affected by this genetic
mutation?
A. DNA mismatch repair
B. Homologous recombination DNA repair
C. Base excision repair
D. Nucleotide excision repair
Correct Answer: B
Explanation: BRCA1 is essential for homologous recombination repair of
double-stranded DNA breaks. Mutation leads to genomic instability and
increased cancer susceptibility.
Question 5
A patient with chronic alcoholism develops hepatic steatosis. Which
cellular organelle is primarily responsible for metabolizing the
accumulated lipids?
A. Lysosomes
B. Peroxisomes
, C. Smooth endoplasmic reticulum
D. Mitochondria
Correct Answer: B
Explanation: Peroxisomes contain enzymes for beta-oxidation of very-
long-chain fatty acids and play a crucial role in lipid metabolism. Alcohol-
induced peroxisomal dysfunction contributes to fatty liver.
Question 6
A 60-year-old male presents with muscle weakness and fatigue. Genetic
testing reveals a mutation in the mitochondrial DNA encoding cytochrome
c oxidase. Which cellular process is directly impaired?
A. Glycolysis in the cytoplasm
B. Electron transport chain activity
C. Fatty acid synthesis
D. Protein folding in the endoplasmic reticulum
Correct Answer: B
Explanation: Cytochrome c oxidase (Complex IV) is essential for electron
transport and ATP production. Mitochondrial mutations impair oxidative
phosphorylation, leading to energy deficiency symptoms.
Question 7
Chamberlain University | Comprehensive Practice Examination |
High-Yield Questions, Answers & Detailed Rationales
Question 1
A 45-year-old patient presents with fatigue, pallor, and shortness of
breath. Laboratory findings reveal macrocytic anemia with
hypersegmented neutrophils. Which cellular mechanism is most likely
impaired in this patient?
A. Iron storage in ferritin complexes
B. DNA synthesis due to vitamin B12 deficiency
C. Hemoglobin chain assembly in erythrocytes
D. Erythropoietin receptor signaling pathway
Correct Answer: B
Explanation: Vitamin B12 deficiency impairs DNA synthesis, causing
megaloblastic anemia characterized by macrocytic erythrocytes and
hypersegmented neutrophils due to ineffective hematopoiesis.
Question 2
A researcher is studying a cell line that demonstrates uncontrolled
proliferation despite contact inhibition signals. Which cellular component
is most likely defective in these cells?
,A. Mitochondrial membrane potential
B. Golgi apparatus protein processing
C. Tumor suppressor gene p53 function
D. Ribosomal protein synthesis
Correct Answer: C
Explanation: p53 is a critical tumor suppressor protein that regulates cell
cycle arrest and apoptosis. Defective p53 allows uncontrolled proliferation
even with contact inhibition signals.
Question 3
During hypoxia, a cell shifts from oxidative phosphorylation to anaerobic
glycolysis. Which ion imbalance would most likely occur as a consequence
of this metabolic shift?
A. Increased intracellular calcium
B. Decreased intracellular sodium
C. Increased intracellular potassium
D. Decreased intracellular hydrogen
Correct Answer: A
,Explanation: Anaerobic glycolysis produces lactic acid, lowering pH and
impairing membrane pumps. The sodium-potassium pump fails, leading to
increased intracellular sodium and calcium accumulation.
Question 4
A 32-year-old woman with a known BRCA1 mutation develops breast
cancer. Which cellular process is directly affected by this genetic
mutation?
A. DNA mismatch repair
B. Homologous recombination DNA repair
C. Base excision repair
D. Nucleotide excision repair
Correct Answer: B
Explanation: BRCA1 is essential for homologous recombination repair of
double-stranded DNA breaks. Mutation leads to genomic instability and
increased cancer susceptibility.
Question 5
A patient with chronic alcoholism develops hepatic steatosis. Which
cellular organelle is primarily responsible for metabolizing the
accumulated lipids?
A. Lysosomes
B. Peroxisomes
, C. Smooth endoplasmic reticulum
D. Mitochondria
Correct Answer: B
Explanation: Peroxisomes contain enzymes for beta-oxidation of very-
long-chain fatty acids and play a crucial role in lipid metabolism. Alcohol-
induced peroxisomal dysfunction contributes to fatty liver.
Question 6
A 60-year-old male presents with muscle weakness and fatigue. Genetic
testing reveals a mutation in the mitochondrial DNA encoding cytochrome
c oxidase. Which cellular process is directly impaired?
A. Glycolysis in the cytoplasm
B. Electron transport chain activity
C. Fatty acid synthesis
D. Protein folding in the endoplasmic reticulum
Correct Answer: B
Explanation: Cytochrome c oxidase (Complex IV) is essential for electron
transport and ATP production. Mitochondrial mutations impair oxidative
phosphorylation, leading to energy deficiency symptoms.
Question 7
