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 different tissue samples. One organism contains
membrane-bound organelles and linear DNA enclosed
within a nucleus, whereas the other lacks a true nucleus
, and contains circular genetic material. The structural
distinction most directly explains differences in which
cellular process?
A. ATP generation through oxidative phosphorylation
B. Storage of glycogen in cytoplasmic granules
C. Spatial separation of transcription and translation
D. Passive diffusion of lipid-soluble molecules
Correct Answer: C
Rationale:
• Clinical Clue: Presence or absence of a membrane-bound
nucleus distinguishes eukaryotic from prokaryotic
organization.
• Mechanism: Eukaryotic cells isolate transcription in the
nucleus while translation occurs in the cytoplasm.
• Why the Correct Answer Is Right: Nuclear
compartmentalization creates temporal and spatial
separation of gene expression.
• Why the Other Options Are Wrong:
A. ATP generation can occur in both systems, though
locations differ.
B. Glycogen storage is not dependent on nuclear
organization.
D. Passive diffusion occurs regardless of nuclear presence.
,• Exam Trap: Equating mitochondria with all ATP production
differences.
• High-Yield Clinical Correlation: Antibiotics exploit
differences between prokaryotic and eukaryotic cellular
machinery.
• Memory Anchor: "Nucleus separates script-writing from
script-reading."
Q2. A patient with severe mitochondrial dysfunction
develops profound fatigue and exercise intolerance
despite normal oxygen delivery. The manifestations are
best accounted for by impaired production of:
A. Structural phospholipids
B. ATP through oxidative metabolism
C. Cytosolic messenger RNA
D. Lysosomal hydrolytic enzymes
Correct Answer: B
Rationale:
• Clinical Clue: Fatigue with preserved oxygen delivery
suggests impaired energy utilization rather than oxygen
transport.
• Mechanism: Mitochondria perform oxidative
phosphorylation to generate ATP.
, • Why the Correct Answer Is Right: Cellular function
becomes energy-limited when ATP synthesis declines.
• Why the Other Options Are Wrong:
A. Lipid synthesis is not the major defect.
C. mRNA transcription primarily occurs in the nucleus.
D. Lysosomal enzymes are synthesized elsewhere.
• Exam Trap: Confusing oxygen presence with oxygen
utilization.
• High-Yield Clinical Correlation: Mitochondrial diseases
often affect tissues with high metabolic demand.
• Memory Anchor: "Mitochondria turn oxygen into usable
energy."
Q3. A pathologist notes accumulation of undigested
intracellular debris in a tissue biopsy. Dysfunction of which
organelle most directly explains this finding?
A. Smooth endoplasmic reticulum
B. Lysosome
C. Golgi apparatus
D. Peroxisome
Correct Answer: B
Rationale:
• Clinical Clue: Intracellular accumulation of debris suggests
defective degradation pathways.
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 different tissue samples. One organism contains
membrane-bound organelles and linear DNA enclosed
within a nucleus, whereas the other lacks a true nucleus
, and contains circular genetic material. The structural
distinction most directly explains differences in which
cellular process?
A. ATP generation through oxidative phosphorylation
B. Storage of glycogen in cytoplasmic granules
C. Spatial separation of transcription and translation
D. Passive diffusion of lipid-soluble molecules
Correct Answer: C
Rationale:
• Clinical Clue: Presence or absence of a membrane-bound
nucleus distinguishes eukaryotic from prokaryotic
organization.
• Mechanism: Eukaryotic cells isolate transcription in the
nucleus while translation occurs in the cytoplasm.
• Why the Correct Answer Is Right: Nuclear
compartmentalization creates temporal and spatial
separation of gene expression.
• Why the Other Options Are Wrong:
A. ATP generation can occur in both systems, though
locations differ.
B. Glycogen storage is not dependent on nuclear
organization.
D. Passive diffusion occurs regardless of nuclear presence.
,• Exam Trap: Equating mitochondria with all ATP production
differences.
• High-Yield Clinical Correlation: Antibiotics exploit
differences between prokaryotic and eukaryotic cellular
machinery.
• Memory Anchor: "Nucleus separates script-writing from
script-reading."
Q2. A patient with severe mitochondrial dysfunction
develops profound fatigue and exercise intolerance
despite normal oxygen delivery. The manifestations are
best accounted for by impaired production of:
A. Structural phospholipids
B. ATP through oxidative metabolism
C. Cytosolic messenger RNA
D. Lysosomal hydrolytic enzymes
Correct Answer: B
Rationale:
• Clinical Clue: Fatigue with preserved oxygen delivery
suggests impaired energy utilization rather than oxygen
transport.
• Mechanism: Mitochondria perform oxidative
phosphorylation to generate ATP.
, • Why the Correct Answer Is Right: Cellular function
becomes energy-limited when ATP synthesis declines.
• Why the Other Options Are Wrong:
A. Lipid synthesis is not the major defect.
C. mRNA transcription primarily occurs in the nucleus.
D. Lysosomal enzymes are synthesized elsewhere.
• Exam Trap: Confusing oxygen presence with oxygen
utilization.
• High-Yield Clinical Correlation: Mitochondrial diseases
often affect tissues with high metabolic demand.
• Memory Anchor: "Mitochondria turn oxygen into usable
energy."
Q3. A pathologist notes accumulation of undigested
intracellular debris in a tissue biopsy. Dysfunction of which
organelle most directly explains this finding?
A. Smooth endoplasmic reticulum
B. Lysosome
C. Golgi apparatus
D. Peroxisome
Correct Answer: B
Rationale:
• Clinical Clue: Intracellular accumulation of debris suggests
defective degradation pathways.
