1|Page
NR507 Advanced Pathophysiology Midterm
Newest Exam Preparation With Complete
Questions And Correct Answers With Rationales
Already Graded A+Brand New Version!!
1. A 45-year-old patient with chronic alcoholism presents with
peripheral neuropathy and Wernicke-Korsakoff syndrome. Which
cellular organelle is most directly involved in the pathogenesis of this
condition?
A) Ribosome
B) Mitochondrion
C) Golgi apparatus
D) Peroxisome
Answer: B) Mitochondrion. Thiamine (vitamin B1) deficiency, common in
alcoholism, impairs mitochondrial enzymes (pyruvate dehydrogenase
and alpha-ketoglutarate dehydrogenase), leading to reduced ATP
production and oxidative stress, which particularly affects highly
metabolic neural tissues.
,2|Page
2. A patient with a genetic mutation in the CFTR gene exhibits defective
chloride transport. This mutation most directly affects which cellular
function?
A) Endocytosis
B) Exocytosis
C) Phagocytosis
D) Pinocytosis
Answer: B) Exocytosis. The CFTR protein is a chloride channel that
resides on the apical membrane of epithelial cells; its defective function
impairs the secretion of chloride and water, disrupting mucociliary
clearance, which is a form of regulated exocytosis.
3. A 60-year-old male with a history of smoking presents with weight
loss and hemoptysis. Biopsy reveals squamous cell carcinoma. Which
genetic alteration is most commonly associated with this malignancy?
A) TP53 mutation
B) KRAS mutation
C) EGFR amplification
D) ALK rearrangement
Answer: A) TP53 mutation. Squamous cell carcinoma of the lung has a
high prevalence of TP53 tumor suppressor gene mutations, leading to
loss of cell cycle arrest and apoptosis, whereas EGFR and ALK
alterations are more common in adenocarcinoma.
,3|Page
4. A child with cystic fibrosis has recurrent pulmonary infections. The
underlying defect in the CFTR protein leads to increased sodium
reabsorption in the respiratory epithelium. This occurs because:
A) CFTR directly activates the sodium-potassium pump
B) Loss of CFTR function eliminates the inhibition of ENaC
C) CFTR mutations increase calcium influx
D) CFTR upregulates aquaporins
Answer: B) Loss of CFTR function eliminates the inhibition of ENaC.
Normally, CFTR inhibits the epithelial sodium channel (ENaC); when
CFTR is defective, ENaC is hyperactive, leading to excessive sodium and
water reabsorption, producing thick, dehydrated mucus.
5. A 32-year-old woman with systemic lupus erythematosus develops
immune complex glomerulonephritis. The tissue damage is primarily
mediated by:
A) Type I hypersensitivity
B) Type II hypersensitivity
C) Type III hypersensitivity
D) Type IV hypersensitivity
Answer: C) Type III hypersensitivity. Immune complex deposition (Type
III) in the glomerular basement membrane activates complement and
, 4|Page
recruits neutrophils, causing inflammation and tissue injury, as seen in
lupus nephritis.
6. A patient is diagnosed with pernicious anemia due to vitamin B12
deficiency. The underlying pathology involves:
A) Absence of intrinsic factor from parietal cells
B) Failure of pancreatic enzyme secretion
C) Small intestinal bacterial overgrowth
D) Chronic Helicobacter pylori infection
Answer: A) Absence of intrinsic factor from parietal cells. Autoimmune
destruction of gastric parietal cells leads to intrinsic factor deficiency,
preventing B12 absorption in the terminal ileum, resulting in
megaloblastic anemia and neurological symptoms.
7. A newborn presents with severe jaundice, hepatosplenomegaly, and
conjugated hyperbilirubinemia. Which condition is most consistent with
these findings?
A) Physiological jaundice of the newborn
B) Breastfeeding jaundice
C) Biliary atresia
D) Glucose-6-phosphate dehydrogenase deficiency
Answer: C) Biliary atresia. This condition presents with conjugated
hyperbilirubinemia, pale stools, and hepatosplenomegaly due to
extrahepatic bile duct obstruction. Physiological and breast milk
NR507 Advanced Pathophysiology Midterm
Newest Exam Preparation With Complete
Questions And Correct Answers With Rationales
Already Graded A+Brand New Version!!
1. A 45-year-old patient with chronic alcoholism presents with
peripheral neuropathy and Wernicke-Korsakoff syndrome. Which
cellular organelle is most directly involved in the pathogenesis of this
condition?
A) Ribosome
B) Mitochondrion
C) Golgi apparatus
D) Peroxisome
Answer: B) Mitochondrion. Thiamine (vitamin B1) deficiency, common in
alcoholism, impairs mitochondrial enzymes (pyruvate dehydrogenase
and alpha-ketoglutarate dehydrogenase), leading to reduced ATP
production and oxidative stress, which particularly affects highly
metabolic neural tissues.
,2|Page
2. A patient with a genetic mutation in the CFTR gene exhibits defective
chloride transport. This mutation most directly affects which cellular
function?
A) Endocytosis
B) Exocytosis
C) Phagocytosis
D) Pinocytosis
Answer: B) Exocytosis. The CFTR protein is a chloride channel that
resides on the apical membrane of epithelial cells; its defective function
impairs the secretion of chloride and water, disrupting mucociliary
clearance, which is a form of regulated exocytosis.
3. A 60-year-old male with a history of smoking presents with weight
loss and hemoptysis. Biopsy reveals squamous cell carcinoma. Which
genetic alteration is most commonly associated with this malignancy?
A) TP53 mutation
B) KRAS mutation
C) EGFR amplification
D) ALK rearrangement
Answer: A) TP53 mutation. Squamous cell carcinoma of the lung has a
high prevalence of TP53 tumor suppressor gene mutations, leading to
loss of cell cycle arrest and apoptosis, whereas EGFR and ALK
alterations are more common in adenocarcinoma.
,3|Page
4. A child with cystic fibrosis has recurrent pulmonary infections. The
underlying defect in the CFTR protein leads to increased sodium
reabsorption in the respiratory epithelium. This occurs because:
A) CFTR directly activates the sodium-potassium pump
B) Loss of CFTR function eliminates the inhibition of ENaC
C) CFTR mutations increase calcium influx
D) CFTR upregulates aquaporins
Answer: B) Loss of CFTR function eliminates the inhibition of ENaC.
Normally, CFTR inhibits the epithelial sodium channel (ENaC); when
CFTR is defective, ENaC is hyperactive, leading to excessive sodium and
water reabsorption, producing thick, dehydrated mucus.
5. A 32-year-old woman with systemic lupus erythematosus develops
immune complex glomerulonephritis. The tissue damage is primarily
mediated by:
A) Type I hypersensitivity
B) Type II hypersensitivity
C) Type III hypersensitivity
D) Type IV hypersensitivity
Answer: C) Type III hypersensitivity. Immune complex deposition (Type
III) in the glomerular basement membrane activates complement and
, 4|Page
recruits neutrophils, causing inflammation and tissue injury, as seen in
lupus nephritis.
6. A patient is diagnosed with pernicious anemia due to vitamin B12
deficiency. The underlying pathology involves:
A) Absence of intrinsic factor from parietal cells
B) Failure of pancreatic enzyme secretion
C) Small intestinal bacterial overgrowth
D) Chronic Helicobacter pylori infection
Answer: A) Absence of intrinsic factor from parietal cells. Autoimmune
destruction of gastric parietal cells leads to intrinsic factor deficiency,
preventing B12 absorption in the terminal ileum, resulting in
megaloblastic anemia and neurological symptoms.
7. A newborn presents with severe jaundice, hepatosplenomegaly, and
conjugated hyperbilirubinemia. Which condition is most consistent with
these findings?
A) Physiological jaundice of the newborn
B) Breastfeeding jaundice
C) Biliary atresia
D) Glucose-6-phosphate dehydrogenase deficiency
Answer: C) Biliary atresia. This condition presents with conjugated
hyperbilirubinemia, pale stools, and hepatosplenomegaly due to
extrahepatic bile duct obstruction. Physiological and breast milk
