,NSG 5140 Final Exam Advanced Pathophysiology Questions And
Answers 2026/2027 South College
Q1. A 64-year-old client develops profound hypotension following a
massive gastrointestinal hemorrhage. After blood pressure is
restored, kidney function continues to deteriorate, and renal
tubular epithelial cells demonstrate mitochondrial swelling and loss
of membrane potential. Which molecular event most directly
explains persistent cellular energy failure?
A) Increased mitochondrial oxidative phosphorylation despite membrane
damage
B) Opening of mitochondrial permeability transition pores causing loss of the
electrochemical gradient required for ATP synthesis
C) Increased electron transport chain efficiency
D) Complete suppression of intracellular calcium accumulation
Correct Answer: B) Opening of mitochondrial permeability transition pores
causing loss of the electrochemical gradient required for ATP synthesis
Rationale: Severe ischemia and reperfusion can trigger mitochondrial
permeability transition through calcium overload and oxidative stress.
Opening of these pores disrupts the mitochondrial membrane potential
required for oxidative phosphorylation. Persistent ATP depletion impairs ion
transport, membrane integrity, and cellular recovery even after systemic
circulation improves.
Q2. A 52-year-old client has a genetic defect affecting intracellular
protein folding. Hepatocytes demonstrate accumulation of abnormal
proteins within the endoplasmic reticulum, increased molecular
chaperone expression, and reduced global protein translation.
Which adaptive response is being activated?
A) Uncontrolled cell proliferation
B) Constitutive mitochondrial autophagy alone
C) Increased genomic DNA replication
D) The unfolded protein response
Correct Answer: D) The unfolded protein response
,Rationale: Accumulation of misfolded proteins within the endoplasmic
reticulum activates the unfolded protein response through signaling
pathways involving PERK, IRE1, and ATF6. These pathways reduce the
production of new proteins, increase folding capacity, and promote clearance
of abnormal proteins. Persistent unresolved stress may eventually activate
apoptosis.
Q3. A 69-year-old client with chronic ischemic heart disease has
increased intracellular reactive oxygen species, reduced antioxidant
activity, and progressive cardiomyocyte injury. Which molecular
consequence most directly contributes to mitochondrial
dysfunction?
A) Oxidative damage to membrane lipids, proteins, and mitochondrial DNA
B) Increased preservation of mitochondrial membrane integrity
C) Complete prevention of electron transport chain abnormalities
D) Reduced production of abnormal protein structures
Correct Answer: A) Oxidative damage to membrane lipids, proteins, and
mitochondrial DNA
Rationale: Excess reactive oxygen species damage cellular components
through lipid peroxidation, protein oxidation, and nucleic acid injury.
Mitochondrial membranes and respiratory chain proteins are especially
vulnerable. Oxidative mitochondrial damage can further increase reactive
oxygen species generation, creating a cycle of impaired energy production
and cellular injury.
Q4. A 58-year-old client with chronic liver disease demonstrates
excessive hepatocyte apoptosis. Tissue analysis reveals increased
mitochondrial cytochrome c release and activation of caspase-9.
Which pathway is primarily responsible?
A) Extrinsic death receptor pathway through caspase-8 alone
B) Pyroptotic signaling mediated exclusively by inflammatory caspases
C) Intrinsic mitochondrial apoptotic pathway
D) Necrotic membrane rupture without regulated signaling
Correct Answer: C) Intrinsic mitochondrial apoptotic pathway
, Rationale: The intrinsic apoptotic pathway responds to intracellular stress,
DNA damage, and mitochondrial dysfunction. Proapoptotic BCL-2 family
proteins promote mitochondrial outer membrane permeabilization, allowing
cytochrome c release. Cytochrome c participates in apoptosome formation,
activating caspase-9 and downstream executioner caspases.
Q5. A 47-year-old client with a hereditary cancer syndrome carries
one pathogenic allele of a tumor suppressor gene. A malignant
tumor develops after the remaining functional allele is inactivated.
Which genetic mechanism explains the transformation?
A) Increased expression of both normal alleles
B) Complete preservation of tumor suppressor activity
C) Increased physiological apoptosis preventing abnormal proliferation
D) Loss of heterozygosity or another somatic event eliminating remaining
tumor suppressor function
Correct Answer: D) Loss of heterozygosity or another somatic event
eliminating remaining tumor suppressor function
Rationale: Many hereditary cancer syndromes involve an inherited
pathogenic variant in one tumor suppressor allele. A subsequent somatic
event may eliminate the remaining functional allele, producing complete loss
of protective signaling. This two-hit mechanism can impair cell cycle
regulation, DNA repair, or apoptosis depending on the affected gene.
Q6. A 42-year-old client has colorectal cancer associated with
defective DNA mismatch repair. Molecular testing demonstrates
high microsatellite instability. Which consequence most directly
promotes malignant progression?
A) Increased elimination of DNA replication errors
B) Accumulation of mutations within repetitive DNA sequences and growth-
regulating genes
C) Complete suppression of genomic instability
D) Increased fidelity of DNA polymerase activity
Correct Answer: B) Accumulation of mutations within repetitive DNA
sequences and growth-regulating genes
Answers 2026/2027 South College
Q1. A 64-year-old client develops profound hypotension following a
massive gastrointestinal hemorrhage. After blood pressure is
restored, kidney function continues to deteriorate, and renal
tubular epithelial cells demonstrate mitochondrial swelling and loss
of membrane potential. Which molecular event most directly
explains persistent cellular energy failure?
A) Increased mitochondrial oxidative phosphorylation despite membrane
damage
B) Opening of mitochondrial permeability transition pores causing loss of the
electrochemical gradient required for ATP synthesis
C) Increased electron transport chain efficiency
D) Complete suppression of intracellular calcium accumulation
Correct Answer: B) Opening of mitochondrial permeability transition pores
causing loss of the electrochemical gradient required for ATP synthesis
Rationale: Severe ischemia and reperfusion can trigger mitochondrial
permeability transition through calcium overload and oxidative stress.
Opening of these pores disrupts the mitochondrial membrane potential
required for oxidative phosphorylation. Persistent ATP depletion impairs ion
transport, membrane integrity, and cellular recovery even after systemic
circulation improves.
Q2. A 52-year-old client has a genetic defect affecting intracellular
protein folding. Hepatocytes demonstrate accumulation of abnormal
proteins within the endoplasmic reticulum, increased molecular
chaperone expression, and reduced global protein translation.
Which adaptive response is being activated?
A) Uncontrolled cell proliferation
B) Constitutive mitochondrial autophagy alone
C) Increased genomic DNA replication
D) The unfolded protein response
Correct Answer: D) The unfolded protein response
,Rationale: Accumulation of misfolded proteins within the endoplasmic
reticulum activates the unfolded protein response through signaling
pathways involving PERK, IRE1, and ATF6. These pathways reduce the
production of new proteins, increase folding capacity, and promote clearance
of abnormal proteins. Persistent unresolved stress may eventually activate
apoptosis.
Q3. A 69-year-old client with chronic ischemic heart disease has
increased intracellular reactive oxygen species, reduced antioxidant
activity, and progressive cardiomyocyte injury. Which molecular
consequence most directly contributes to mitochondrial
dysfunction?
A) Oxidative damage to membrane lipids, proteins, and mitochondrial DNA
B) Increased preservation of mitochondrial membrane integrity
C) Complete prevention of electron transport chain abnormalities
D) Reduced production of abnormal protein structures
Correct Answer: A) Oxidative damage to membrane lipids, proteins, and
mitochondrial DNA
Rationale: Excess reactive oxygen species damage cellular components
through lipid peroxidation, protein oxidation, and nucleic acid injury.
Mitochondrial membranes and respiratory chain proteins are especially
vulnerable. Oxidative mitochondrial damage can further increase reactive
oxygen species generation, creating a cycle of impaired energy production
and cellular injury.
Q4. A 58-year-old client with chronic liver disease demonstrates
excessive hepatocyte apoptosis. Tissue analysis reveals increased
mitochondrial cytochrome c release and activation of caspase-9.
Which pathway is primarily responsible?
A) Extrinsic death receptor pathway through caspase-8 alone
B) Pyroptotic signaling mediated exclusively by inflammatory caspases
C) Intrinsic mitochondrial apoptotic pathway
D) Necrotic membrane rupture without regulated signaling
Correct Answer: C) Intrinsic mitochondrial apoptotic pathway
, Rationale: The intrinsic apoptotic pathway responds to intracellular stress,
DNA damage, and mitochondrial dysfunction. Proapoptotic BCL-2 family
proteins promote mitochondrial outer membrane permeabilization, allowing
cytochrome c release. Cytochrome c participates in apoptosome formation,
activating caspase-9 and downstream executioner caspases.
Q5. A 47-year-old client with a hereditary cancer syndrome carries
one pathogenic allele of a tumor suppressor gene. A malignant
tumor develops after the remaining functional allele is inactivated.
Which genetic mechanism explains the transformation?
A) Increased expression of both normal alleles
B) Complete preservation of tumor suppressor activity
C) Increased physiological apoptosis preventing abnormal proliferation
D) Loss of heterozygosity or another somatic event eliminating remaining
tumor suppressor function
Correct Answer: D) Loss of heterozygosity or another somatic event
eliminating remaining tumor suppressor function
Rationale: Many hereditary cancer syndromes involve an inherited
pathogenic variant in one tumor suppressor allele. A subsequent somatic
event may eliminate the remaining functional allele, producing complete loss
of protective signaling. This two-hit mechanism can impair cell cycle
regulation, DNA repair, or apoptosis depending on the affected gene.
Q6. A 42-year-old client has colorectal cancer associated with
defective DNA mismatch repair. Molecular testing demonstrates
high microsatellite instability. Which consequence most directly
promotes malignant progression?
A) Increased elimination of DNA replication errors
B) Accumulation of mutations within repetitive DNA sequences and growth-
regulating genes
C) Complete suppression of genomic instability
D) Increased fidelity of DNA polymerase activity
Correct Answer: B) Accumulation of mutations within repetitive DNA
sequences and growth-regulating genes
