McCance & Huether’s Pathophysiology
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A microbiology researcher compares two rapidly
dividing organisms under electron microscopy. One
organism lacks a membrane-bound nucleus, contains
circular DNA, and reproduces through binary fission. The
second contains histone-associated linear chromosomes
and extensive intracellular organelles. The structural
, difference most directly explains which functional
distinction?
A. Ability to generate ATP through oxidative
phosphorylation
B. Presence of ribosomal protein synthesis
C. Separation of transcription from translation
D. Utilization of plasma membrane transport proteins
Correct Answer: C
Rationale:
• Clinical Clue: The organism with a membrane-bound
nucleus is eukaryotic.
• Mechanism: Eukaryotes compartmentalize DNA within the
nucleus, separating transcription from cytoplasmic
translation. Prokaryotes couple these processes because
they lack nuclear membranes.
• Why the Correct Answer Is Right: Nuclear
compartmentalization fundamentally distinguishes
eukaryotic gene expression.
• Why the Other Options Are Wrong:
o A. Both cell types can generate ATP.
o B. Ribosomes exist in both prokaryotes and
eukaryotes.
o D. Membrane transport proteins are present in both.
,• Exam Trap: Assuming mitochondria are required for all
ATP generation.
• High-Yield Clinical Correlation: Many antibiotics selectively
target prokaryotic transcription-translation coupling.
• Memory Anchor: “No nucleus = simultaneous transcription
and translation.”
Q2. A child with recurrent respiratory infections is found to
have defective dynein arms within cilia lining the
respiratory epithelium. The impaired cellular function
most directly involves failure of which process?
A. Intracellular protein degradation
B. ATP synthesis within mitochondria
C. Microtubule-mediated motility
D. Actin-mediated endocytosis
Correct Answer: C
Rationale:
• Clinical Clue: Dynein arm defects impair ciliary movement.
• Mechanism: Cilia rely on microtubules arranged in a 9+2
structure with dynein-driven sliding.
• Why the Correct Answer Is Right: Dynein converts ATP into
movement along microtubules.
• Why the Other Options Are Wrong:
, o A. Lysosomes mediate degradation.
o B. Mitochondria generate ATP independently of
dynein.
o D. Endocytosis mainly depends on actin remodeling.
• Exam Trap: Confusing cytoskeletal elements and their
functions.
• High-Yield Clinical Correlation: Primary ciliary dyskinesia
can cause infertility and bronchiectasis.
• Memory Anchor: “Cilia move on microtubule tracks.”
Q3. A patient with severe hypoxia develops cellular
swelling shortly after cardiogenic shock. The earliest
pathophysiologic change most directly responsible for this
finding is failure of which membrane process?
A. Calcium influx through ligand-gated channels
B. Sodium-potassium ATPase activity
C. Receptor-mediated endocytosis
D. Chloride-bicarbonate exchange
Correct Answer: B
Rationale:
• Clinical Clue: Early hypoxic injury causes cell swelling.
• Mechanism: ATP depletion impairs Na+/K+ ATPase activity,
allowing intracellular sodium and water accumulation.
The Biologic Basis for Disease in Adults
and Children
9th Edition
Author(s)Julia Rogers
TEST BANK
Q1. A microbiology researcher compares two rapidly
dividing organisms under electron microscopy. One
organism lacks a membrane-bound nucleus, contains
circular DNA, and reproduces through binary fission. The
second contains histone-associated linear chromosomes
and extensive intracellular organelles. The structural
, difference most directly explains which functional
distinction?
A. Ability to generate ATP through oxidative
phosphorylation
B. Presence of ribosomal protein synthesis
C. Separation of transcription from translation
D. Utilization of plasma membrane transport proteins
Correct Answer: C
Rationale:
• Clinical Clue: The organism with a membrane-bound
nucleus is eukaryotic.
• Mechanism: Eukaryotes compartmentalize DNA within the
nucleus, separating transcription from cytoplasmic
translation. Prokaryotes couple these processes because
they lack nuclear membranes.
• Why the Correct Answer Is Right: Nuclear
compartmentalization fundamentally distinguishes
eukaryotic gene expression.
• Why the Other Options Are Wrong:
o A. Both cell types can generate ATP.
o B. Ribosomes exist in both prokaryotes and
eukaryotes.
o D. Membrane transport proteins are present in both.
,• Exam Trap: Assuming mitochondria are required for all
ATP generation.
• High-Yield Clinical Correlation: Many antibiotics selectively
target prokaryotic transcription-translation coupling.
• Memory Anchor: “No nucleus = simultaneous transcription
and translation.”
Q2. A child with recurrent respiratory infections is found to
have defective dynein arms within cilia lining the
respiratory epithelium. The impaired cellular function
most directly involves failure of which process?
A. Intracellular protein degradation
B. ATP synthesis within mitochondria
C. Microtubule-mediated motility
D. Actin-mediated endocytosis
Correct Answer: C
Rationale:
• Clinical Clue: Dynein arm defects impair ciliary movement.
• Mechanism: Cilia rely on microtubules arranged in a 9+2
structure with dynein-driven sliding.
• Why the Correct Answer Is Right: Dynein converts ATP into
movement along microtubules.
• Why the Other Options Are Wrong:
, o A. Lysosomes mediate degradation.
o B. Mitochondria generate ATP independently of
dynein.
o D. Endocytosis mainly depends on actin remodeling.
• Exam Trap: Confusing cytoskeletal elements and their
functions.
• High-Yield Clinical Correlation: Primary ciliary dyskinesia
can cause infertility and bronchiectasis.
• Memory Anchor: “Cilia move on microtubule tracks.”
Q3. A patient with severe hypoxia develops cellular
swelling shortly after cardiogenic shock. The earliest
pathophysiologic change most directly responsible for this
finding is failure of which membrane process?
A. Calcium influx through ligand-gated channels
B. Sodium-potassium ATPase activity
C. Receptor-mediated endocytosis
D. Chloride-bicarbonate exchange
Correct Answer: B
Rationale:
• Clinical Clue: Early hypoxic injury causes cell swelling.
• Mechanism: ATP depletion impairs Na+/K+ ATPase activity,
allowing intracellular sodium and water accumulation.
