McCance & Huether’s Pathophysiology
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A researcher observes a microorganism that lacks a
membrane-bound nucleus, contains circular DNA, and
divides by binary fission. Which structural feature most
directly explains its rapid replication compared with
human cells?
A. Presence of multiple linear chromosomes
B. Absence of histone proteins
, C. Lack of membrane-bound organelles
D. High density of mitochondria
Correct Answer: C
Rationale:
• Clinical Clue: Prokaryotic cell with rapid replication.
• Mechanism: Absence of organelles allows simultaneous
transcription and translation, accelerating growth.
• Why the Correct Answer Is Right: Prokaryotes lack
compartmentalization, enabling efficient metabolic and
replication processes.
• Why the Other Options Are Wrong: A is incorrect—
prokaryotes have circular DNA; B is partially true but not
the primary driver; D is incorrect—prokaryotes lack
mitochondria.
• Exam Trap: Confusing DNA structure with replication
speed determinants.
• High-Yield Clinical Correlation: Bacterial proliferation in
infection reflects this efficiency.
• Memory Anchor: “No compartments = faster replication.”
Q2. A patient with a genetic disorder exhibits defective
intracellular protein trafficking and accumulation of
, misfolded proteins. Dysfunction of which organelle best
accounts for this finding?
A. Lysosome
B. Golgi apparatus
C. Rough endoplasmic reticulum
D. Peroxisome
Correct Answer: C
Rationale:
• Clinical Clue: Misfolded protein accumulation.
• Mechanism: Rough ER ensures proper protein folding and
quality control.
• Why the Correct Answer Is Right: Defective RER leads to
improper folding and accumulation of proteins.
• Why the Other Options Are Wrong: A degrades waste; B
modifies and sorts; D handles oxidative reactions.
• Exam Trap: Confusing protein modification (Golgi) with
folding (RER).
• High-Yield Clinical Correlation: Seen in diseases like cystic
fibrosis (misfolded CFTR).
• Memory Anchor: “RER = protein folding checkpoint.”
, Q3. A cell exposed to a toxin shows impaired ATP
production and increased reactive oxygen species. Which
organelle dysfunction best explains these findings?
A. Nucleus
B. Mitochondria
C. Ribosomes
D. Golgi apparatus
Correct Answer: B
Rationale:
• Clinical Clue: ATP depletion and oxidative stress.
• Mechanism: Mitochondria generate ATP and regulate
oxidative metabolism.
• Why the Correct Answer Is Right: Dysfunction disrupts
oxidative phosphorylation and increases ROS.
• Why the Other Options Are Wrong: A controls DNA; C
synthesizes proteins; D modifies proteins.
• Exam Trap: Attributing energy failure to ribosomes.
• High-Yield Clinical Correlation: Mitochondrial injury in
ischemia.
• Memory Anchor: “Mitochondria = power + ROS control.”
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A researcher observes a microorganism that lacks a
membrane-bound nucleus, contains circular DNA, and
divides by binary fission. Which structural feature most
directly explains its rapid replication compared with
human cells?
A. Presence of multiple linear chromosomes
B. Absence of histone proteins
, C. Lack of membrane-bound organelles
D. High density of mitochondria
Correct Answer: C
Rationale:
• Clinical Clue: Prokaryotic cell with rapid replication.
• Mechanism: Absence of organelles allows simultaneous
transcription and translation, accelerating growth.
• Why the Correct Answer Is Right: Prokaryotes lack
compartmentalization, enabling efficient metabolic and
replication processes.
• Why the Other Options Are Wrong: A is incorrect—
prokaryotes have circular DNA; B is partially true but not
the primary driver; D is incorrect—prokaryotes lack
mitochondria.
• Exam Trap: Confusing DNA structure with replication
speed determinants.
• High-Yield Clinical Correlation: Bacterial proliferation in
infection reflects this efficiency.
• Memory Anchor: “No compartments = faster replication.”
Q2. A patient with a genetic disorder exhibits defective
intracellular protein trafficking and accumulation of
, misfolded proteins. Dysfunction of which organelle best
accounts for this finding?
A. Lysosome
B. Golgi apparatus
C. Rough endoplasmic reticulum
D. Peroxisome
Correct Answer: C
Rationale:
• Clinical Clue: Misfolded protein accumulation.
• Mechanism: Rough ER ensures proper protein folding and
quality control.
• Why the Correct Answer Is Right: Defective RER leads to
improper folding and accumulation of proteins.
• Why the Other Options Are Wrong: A degrades waste; B
modifies and sorts; D handles oxidative reactions.
• Exam Trap: Confusing protein modification (Golgi) with
folding (RER).
• High-Yield Clinical Correlation: Seen in diseases like cystic
fibrosis (misfolded CFTR).
• Memory Anchor: “RER = protein folding checkpoint.”
, Q3. A cell exposed to a toxin shows impaired ATP
production and increased reactive oxygen species. Which
organelle dysfunction best explains these findings?
A. Nucleus
B. Mitochondria
C. Ribosomes
D. Golgi apparatus
Correct Answer: B
Rationale:
• Clinical Clue: ATP depletion and oxidative stress.
• Mechanism: Mitochondria generate ATP and regulate
oxidative metabolism.
• Why the Correct Answer Is Right: Dysfunction disrupts
oxidative phosphorylation and increases ROS.
• Why the Other Options Are Wrong: A controls DNA; C
synthesizes proteins; D modifies proteins.
• Exam Trap: Attributing energy failure to ribosomes.
• High-Yield Clinical Correlation: Mitochondrial injury in
ischemia.
• Memory Anchor: “Mitochondria = power + ROS control.”
