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 isolated
from separate patients. Organism A possesses a
membrane-bound nucleus and abundant organelles,
whereas organism B lacks internal membrane structures
, and replicates rapidly through binary fission. The biologic
distinction most directly explaining their different
organizational complexity is the presence of which feature
in organism A?
A. Peptidoglycan-rich cell wall
B. Membrane-bound intracellular compartmentalization
C. Circular cytoplasmic DNA without histones
D. Ribosomes anchored exclusively to the plasma
membrane
Correct Answer: B
Rationale:
• Clinical Clue: The organism with a nucleus and organelles
demonstrates eukaryotic organization.
• Mechanism: Eukaryotic cells achieve specialized
intracellular functions through membrane-bound
organelles that separate metabolic tasks spatially.
• Why the Correct Answer Is Right: Membrane
compartmentalization permits specialized processing such
as protein modification, energy generation, and
intracellular trafficking.
• Why the Other Options Are Wrong:
o A: Peptidoglycan characterizes bacterial cell walls.
o C: Circular DNA without histones is typical of
prokaryotes.
, o D: Ribosomes are distributed throughout cytoplasm
and rough endoplasmic reticulum rather than
confined to membranes.
• Exam Trap: Confusing “nucleus” with DNA content rather
than cellular compartmentalization.
• High-Yield Clinical Correlation: Many antibiotics selectively
target prokaryotic cellular structures absent in eukaryotes.
• Memory Anchor: Eukaryote = “enclosed” internal
architecture.
Q2. A patient develops progressive muscle weakness after
prolonged fasting. Skeletal muscle biopsy demonstrates
increased utilization of intracellular structures responsible
for ATP generation. Dysfunction of which organelle would
best account for worsening fatigue during nutrient
deprivation?
A. Golgi apparatus
B. Lysosome
C. Mitochondrion
D. Smooth endoplasmic reticulum
Correct Answer: C
Rationale:
• Clinical Clue: Energy failure and fasting intolerance point
to impaired ATP production.
, • Mechanism: Mitochondria generate ATP through oxidative
phosphorylation and coordinate aerobic metabolism.
• Why the Correct Answer Is Right: Muscle energy demands
become increasingly dependent on mitochondrial ATP
production during fasting.
• Why the Other Options Are Wrong:
o A: Golgi apparatus modifies and packages proteins.
o B: Lysosomes degrade intracellular debris.
o D: Smooth ER is involved in lipid metabolism and
detoxification.
• Exam Trap: Overattributing energy production to
cytoplasmic glycolysis.
• High-Yield Clinical Correlation: Mitochondrial dysfunction
often presents with exercise intolerance and
neuromuscular manifestations.
• Memory Anchor: Mitochondria = cellular power supply.
Q3. A child with recurrent respiratory infections is found to
have defective ciliary movement due to impaired
microtubule-associated transport. The abnormality most
directly affects which cellular component?
A. Intermediate filaments
B. Actin microfilaments
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A researcher compares two microorganisms isolated
from separate patients. Organism A possesses a
membrane-bound nucleus and abundant organelles,
whereas organism B lacks internal membrane structures
, and replicates rapidly through binary fission. The biologic
distinction most directly explaining their different
organizational complexity is the presence of which feature
in organism A?
A. Peptidoglycan-rich cell wall
B. Membrane-bound intracellular compartmentalization
C. Circular cytoplasmic DNA without histones
D. Ribosomes anchored exclusively to the plasma
membrane
Correct Answer: B
Rationale:
• Clinical Clue: The organism with a nucleus and organelles
demonstrates eukaryotic organization.
• Mechanism: Eukaryotic cells achieve specialized
intracellular functions through membrane-bound
organelles that separate metabolic tasks spatially.
• Why the Correct Answer Is Right: Membrane
compartmentalization permits specialized processing such
as protein modification, energy generation, and
intracellular trafficking.
• Why the Other Options Are Wrong:
o A: Peptidoglycan characterizes bacterial cell walls.
o C: Circular DNA without histones is typical of
prokaryotes.
, o D: Ribosomes are distributed throughout cytoplasm
and rough endoplasmic reticulum rather than
confined to membranes.
• Exam Trap: Confusing “nucleus” with DNA content rather
than cellular compartmentalization.
• High-Yield Clinical Correlation: Many antibiotics selectively
target prokaryotic cellular structures absent in eukaryotes.
• Memory Anchor: Eukaryote = “enclosed” internal
architecture.
Q2. A patient develops progressive muscle weakness after
prolonged fasting. Skeletal muscle biopsy demonstrates
increased utilization of intracellular structures responsible
for ATP generation. Dysfunction of which organelle would
best account for worsening fatigue during nutrient
deprivation?
A. Golgi apparatus
B. Lysosome
C. Mitochondrion
D. Smooth endoplasmic reticulum
Correct Answer: C
Rationale:
• Clinical Clue: Energy failure and fasting intolerance point
to impaired ATP production.
, • Mechanism: Mitochondria generate ATP through oxidative
phosphorylation and coordinate aerobic metabolism.
• Why the Correct Answer Is Right: Muscle energy demands
become increasingly dependent on mitochondrial ATP
production during fasting.
• Why the Other Options Are Wrong:
o A: Golgi apparatus modifies and packages proteins.
o B: Lysosomes degrade intracellular debris.
o D: Smooth ER is involved in lipid metabolism and
detoxification.
• Exam Trap: Overattributing energy production to
cytoplasmic glycolysis.
• High-Yield Clinical Correlation: Mitochondrial dysfunction
often presents with exercise intolerance and
neuromuscular manifestations.
• Memory Anchor: Mitochondria = cellular power supply.
Q3. A child with recurrent respiratory infections is found to
have defective ciliary movement due to impaired
microtubule-associated transport. The abnormality most
directly affects which cellular component?
A. Intermediate filaments
B. Actin microfilaments
