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 a bacterial organism with a human
epithelial cell and notes that only one of the cells contains
membrane-bound intracellular compartments and organized
chromosomal packaging. This distinction most directly explains
which functional advantage of the human cell?
A. Ability to synthesize proteins without ribosomal participation
B. Capacity for compartmentalized metabolic specialization
,C. Reliance on passive diffusion for intracellular signaling
D. Inability to alter genetic transcription in response to stress
Correct Answer: B
Rationale:
• Clinical Clue: Comparison of prokaryotic versus eukaryotic
organization.
• Mechanism: Eukaryotic cells possess membrane-bound
organelles that spatially separate functions such as ATP
generation, protein processing, and intracellular digestion.
• Why the Correct Answer Is Right: Compartmentalization
allows specialized metabolic activities to occur
simultaneously and efficiently.
• Why the Other Options Are Wrong:
o A: Protein synthesis requires ribosomes in both cell
types.
o C: Eukaryotic signaling frequently depends on
receptor-mediated pathways rather than passive
diffusion alone.
o D: Eukaryotic cells dynamically regulate gene
expression.
• Exam Trap: Assuming “complexity” refers only to nuclear
presence rather than metabolic organization.
, • High-Yield Clinical Correlation: Many antimicrobial drugs
exploit structural differences between prokaryotic and
eukaryotic cells.
• Memory Anchor: Eukaryotes = enclosed organelles =
efficiency through specialization.
Q2. A child with a hereditary mitochondrial disorder presents
with muscle weakness, developmental delay, and exercise
intolerance. Which pathophysiologic change best accounts for
these findings?
A. Impaired lysosomal degradation of cellular debris
B. Reduced oxidative phosphorylation and ATP generation
C. Excessive intracellular calcium sequestration in the Golgi
apparatus
D. Failure of nuclear transcription of messenger RNA
Correct Answer: B
Rationale:
• Clinical Clue: Fatigue and high-energy tissue dysfunction
suggest mitochondrial pathology.
• Mechanism: Mitochondria generate ATP through oxidative
phosphorylation; impaired electron transport
compromises energy production.
, • Why the Correct Answer Is Right: Tissues with high
metabolic demand—muscle, nervous tissue,
myocardium—are most affected by ATP deficiency.
• Why the Other Options Are Wrong:
o A: Lysosomal dysfunction causes storage disorders,
not classic energy failure.
o C: Golgi function is not the primary mechanism of
energy depletion.
o D: Nuclear transcription abnormalities produce
broader gene expression disorders.
• Exam Trap: Confusing mitochondrial disease with general
metabolic disorders.
• High-Yield Clinical Correlation: Lactic acidosis commonly
accompanies mitochondrial dysfunction due to increased
anaerobic metabolism.
• Memory Anchor: Mitochondria fail → ATP falls → fatigue
follows.
Q3. A patient develops severe hepatotoxicity after exposure to
a chemical that selectively injures rough endoplasmic reticulum
(RER). Which cellular consequence is most likely?
A. Defective lipid metabolism and steroid synthesis
B. Impaired intracellular digestion of damaged proteins
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A researcher compares a bacterial organism with a human
epithelial cell and notes that only one of the cells contains
membrane-bound intracellular compartments and organized
chromosomal packaging. This distinction most directly explains
which functional advantage of the human cell?
A. Ability to synthesize proteins without ribosomal participation
B. Capacity for compartmentalized metabolic specialization
,C. Reliance on passive diffusion for intracellular signaling
D. Inability to alter genetic transcription in response to stress
Correct Answer: B
Rationale:
• Clinical Clue: Comparison of prokaryotic versus eukaryotic
organization.
• Mechanism: Eukaryotic cells possess membrane-bound
organelles that spatially separate functions such as ATP
generation, protein processing, and intracellular digestion.
• Why the Correct Answer Is Right: Compartmentalization
allows specialized metabolic activities to occur
simultaneously and efficiently.
• Why the Other Options Are Wrong:
o A: Protein synthesis requires ribosomes in both cell
types.
o C: Eukaryotic signaling frequently depends on
receptor-mediated pathways rather than passive
diffusion alone.
o D: Eukaryotic cells dynamically regulate gene
expression.
• Exam Trap: Assuming “complexity” refers only to nuclear
presence rather than metabolic organization.
, • High-Yield Clinical Correlation: Many antimicrobial drugs
exploit structural differences between prokaryotic and
eukaryotic cells.
• Memory Anchor: Eukaryotes = enclosed organelles =
efficiency through specialization.
Q2. A child with a hereditary mitochondrial disorder presents
with muscle weakness, developmental delay, and exercise
intolerance. Which pathophysiologic change best accounts for
these findings?
A. Impaired lysosomal degradation of cellular debris
B. Reduced oxidative phosphorylation and ATP generation
C. Excessive intracellular calcium sequestration in the Golgi
apparatus
D. Failure of nuclear transcription of messenger RNA
Correct Answer: B
Rationale:
• Clinical Clue: Fatigue and high-energy tissue dysfunction
suggest mitochondrial pathology.
• Mechanism: Mitochondria generate ATP through oxidative
phosphorylation; impaired electron transport
compromises energy production.
, • Why the Correct Answer Is Right: Tissues with high
metabolic demand—muscle, nervous tissue,
myocardium—are most affected by ATP deficiency.
• Why the Other Options Are Wrong:
o A: Lysosomal dysfunction causes storage disorders,
not classic energy failure.
o C: Golgi function is not the primary mechanism of
energy depletion.
o D: Nuclear transcription abnormalities produce
broader gene expression disorders.
• Exam Trap: Confusing mitochondrial disease with general
metabolic disorders.
• High-Yield Clinical Correlation: Lactic acidosis commonly
accompanies mitochondrial dysfunction due to increased
anaerobic metabolism.
• Memory Anchor: Mitochondria fail → ATP falls → fatigue
follows.
Q3. A patient develops severe hepatotoxicity after exposure to
a chemical that selectively injures rough endoplasmic reticulum
(RER). Which cellular consequence is most likely?
A. Defective lipid metabolism and steroid synthesis
B. Impaired intracellular digestion of damaged proteins
