McCance & Huether’s Pathophysiology
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A researcher compares two microorganisms under
electron microscopy. One organism lacks a membrane-
bound nucleus and contains circular DNA suspended
within the cytoplasm. The second organism demonstrates
mitochondria, endoplasmic reticulum, and linear
chromosomal organization. The structural difference most
directly explains which functional distinction?
, A. Ability to perform glycolysis in the cytoplasm
B. Dependence on ribosomes for protein synthesis
C. Capacity for compartmentalized intracellular
metabolism
D. Requirement for ATP to drive membrane transport
Correct Answer: C
Rationale:
• Clinical Clue: Presence of membrane-bound organelles
distinguishes eukaryotic cells.
• Mechanism: Organelles permit spatial separation of
metabolic pathways, improving efficiency and regulation.
• Why the Correct Answer Is Right: Eukaryotic
compartmentalization allows specialized processes such as
oxidative phosphorylation within mitochondria and
protein modification in the Golgi apparatus.
• Why the Other Options Are Wrong:
o A. Both prokaryotes and eukaryotes perform
glycolysis in the cytoplasm.
o B. Ribosomes exist in both cell types.
o D. ATP-dependent transport occurs in both
organisms.
• Exam Trap: Confusing presence of mitochondria with
exclusive ATP production capability.
,• High-Yield Clinical Correlation: Many antibiotics selectively
target prokaryotic ribosomes because of structural
differences from eukaryotic ribosomes.
• Memory Anchor: “Organelles create specialized cellular
workspaces.”
Q2. A patient with severe mitochondrial dysfunction
develops profound fatigue, skeletal muscle weakness, and
lactic acidosis during minimal exertion. The underlying
defect most directly impairs which process?
A. Anaerobic glucose breakdown
B. Oxidative phosphorylation
C. Cytoplasmic protein synthesis
D. DNA transcription within the nucleus
Correct Answer: B
Rationale:
• Clinical Clue: Lactic acidosis and exercise intolerance
suggest impaired aerobic ATP production.
• Mechanism: Mitochondria generate ATP through the
electron transport chain and oxidative phosphorylation.
• Why the Correct Answer Is Right: Defective oxidative
phosphorylation reduces ATP yield and shifts metabolism
toward anaerobic glycolysis, increasing lactate production.
• Why the Other Options Are Wrong:
, o A. Anaerobic glycolysis remains functional and
becomes compensatory.
o C. Protein synthesis mainly occurs at ribosomes.
o D. Nuclear transcription is not the primary ATP-
producing process.
• Exam Trap: Assuming glycolysis occurs inside
mitochondria.
• High-Yield Clinical Correlation: Mitochondrial diseases
often affect tissues with high energy demand such as
brain, myocardium, and skeletal muscle.
• Memory Anchor: “Mitochondria power aerobic
endurance.”
Q3. A child with a congenital defect in lysosomal enzyme
trafficking develops progressive neurodegeneration and
accumulation of intracellular debris. Electron microscopy
reveals numerous undigested substrates within
membrane-bound vesicles. This finding best accounts for
which pathophysiologic consequence?
A. Excessive oxidative ATP production
B. Failure of intracellular waste degradation
C. Accelerated DNA replication
D. Increased membrane receptor synthesis
Correct Answer: B
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A researcher compares two microorganisms under
electron microscopy. One organism lacks a membrane-
bound nucleus and contains circular DNA suspended
within the cytoplasm. The second organism demonstrates
mitochondria, endoplasmic reticulum, and linear
chromosomal organization. The structural difference most
directly explains which functional distinction?
, A. Ability to perform glycolysis in the cytoplasm
B. Dependence on ribosomes for protein synthesis
C. Capacity for compartmentalized intracellular
metabolism
D. Requirement for ATP to drive membrane transport
Correct Answer: C
Rationale:
• Clinical Clue: Presence of membrane-bound organelles
distinguishes eukaryotic cells.
• Mechanism: Organelles permit spatial separation of
metabolic pathways, improving efficiency and regulation.
• Why the Correct Answer Is Right: Eukaryotic
compartmentalization allows specialized processes such as
oxidative phosphorylation within mitochondria and
protein modification in the Golgi apparatus.
• Why the Other Options Are Wrong:
o A. Both prokaryotes and eukaryotes perform
glycolysis in the cytoplasm.
o B. Ribosomes exist in both cell types.
o D. ATP-dependent transport occurs in both
organisms.
• Exam Trap: Confusing presence of mitochondria with
exclusive ATP production capability.
,• High-Yield Clinical Correlation: Many antibiotics selectively
target prokaryotic ribosomes because of structural
differences from eukaryotic ribosomes.
• Memory Anchor: “Organelles create specialized cellular
workspaces.”
Q2. A patient with severe mitochondrial dysfunction
develops profound fatigue, skeletal muscle weakness, and
lactic acidosis during minimal exertion. The underlying
defect most directly impairs which process?
A. Anaerobic glucose breakdown
B. Oxidative phosphorylation
C. Cytoplasmic protein synthesis
D. DNA transcription within the nucleus
Correct Answer: B
Rationale:
• Clinical Clue: Lactic acidosis and exercise intolerance
suggest impaired aerobic ATP production.
• Mechanism: Mitochondria generate ATP through the
electron transport chain and oxidative phosphorylation.
• Why the Correct Answer Is Right: Defective oxidative
phosphorylation reduces ATP yield and shifts metabolism
toward anaerobic glycolysis, increasing lactate production.
• Why the Other Options Are Wrong:
, o A. Anaerobic glycolysis remains functional and
becomes compensatory.
o C. Protein synthesis mainly occurs at ribosomes.
o D. Nuclear transcription is not the primary ATP-
producing process.
• Exam Trap: Assuming glycolysis occurs inside
mitochondria.
• High-Yield Clinical Correlation: Mitochondrial diseases
often affect tissues with high energy demand such as
brain, myocardium, and skeletal muscle.
• Memory Anchor: “Mitochondria power aerobic
endurance.”
Q3. A child with a congenital defect in lysosomal enzyme
trafficking develops progressive neurodegeneration and
accumulation of intracellular debris. Electron microscopy
reveals numerous undigested substrates within
membrane-bound vesicles. This finding best accounts for
which pathophysiologic consequence?
A. Excessive oxidative ATP production
B. Failure of intracellular waste degradation
C. Accelerated DNA replication
D. Increased membrane receptor synthesis
Correct Answer: B
