McCance & Huether's Pathophysiology: The Biologic Basis for Disease
in Adults and Children (9th Edition) by Julia Rogers
Comprehensive 180-Question Multiple-Choice Examination with
Answers and Rationales
PART ONE: CENTRAL CONCEPTS OF PATHOPHYSIOLOGY: CELLS AND TISSUES
UNIT I: THE CELL
CHAPTER 1: CELLULAR BIOLOGY
Question 1. Which statement best describes the cellular function of metabolic absorption?
A. Cells can produce proteins.
B. Cells can secrete digestive enzymes.
C. Cells can take in and use nutrients.
D. Cells can synthesize fats.
Answer: C. In metabolic absorption, all cells take in and use nutrients and other substances
from their surroundings. This is a fundamental cellular function that enables cells to acquire raw
materials needed for growth, repair, and energy production. Protein production, enzyme
secretion, and fat synthesis are specialized functions, not the definition of metabolic absorption.
Question 2. Where is most of a cell's genetic information, including RNA and DNA, contained?
A. Mitochondria
B. Ribosome
C. Nucleolus
D. Lysosome
Answer: C. The nucleus contains the nucleolus, a small dense structure composed largely of
RNA, most of the cellular DNA, and DNA-binding proteins such as histones, which regulate its
activity. Mitochondria are responsible for cellular respiration and energy production. Ribosomes
provide sites for protein synthesis. Lysosomes function as the intracellular digestive system.
Question 3. Which component of the cell produces hydrogen peroxide (H₂O₂) by using oxygen
to remove hydrogen atoms from specific substrates in an oxidative reaction?
A. Lysosomes
B. Peroxisomes
C. Ribosomes
D. Endosomes
Answer: B. Peroxisomes contain enzymes that use oxygen to remove hydrogen atoms from
specific substrates in an oxidative reaction that produces H₂O₂, a powerful oxidant that can be
destructive if it accumulates or escapes. Ribosomes are RNA-protein complexes for protein
,synthesis. Lysosomes contain digestive enzymes. Endosomes are vesicles pinched off from the
cellular membrane.
Question 4. A patient with hypoxic tissue injury shows cellular swelling. Which failed cellular
function best explains this early change?
A. Mitochondrial DNA damage
B. Loss of Na⁺/K⁺ ATPase activity
C. Increased lysosomal enzyme release
D. Activation of caspases
Answer: B. The Na⁺/K⁺ ATPase pump maintains osmotic balance by actively transporting sodium
out of and potassium into cells. When ATP production is compromised during hypoxia, this
pump fails, allowing sodium to accumulate intracellularly, drawing water into the cell and
causing cellular swelling—the earliest manifestation of reversible cell injury.
Question 5. Which statement best describes the function of the Golgi apparatus?
A. Synthesis of ribosomal RNA
B. Packaging and modifying proteins for secretion
C. Production of adenosine triphosphate (ATP)
D. Intracellular digestion of worn-out organelles
Answer: B. The Golgi apparatus processes, packages, and modifies proteins and lipids
synthesized in the endoplasmic reticulum, preparing them for secretion or delivery to other
cellular destinations. Ribosomal RNA is synthesized in the nucleolus. ATP is produced in
mitochondria. Intracellular digestion occurs in lysosomes.
Question 6. A patient has a bacterial bloodstream infection. Which cellular feature of bacteria
most directly explains why aminoglycoside antibiotics selectively inhibit bacterial protein
synthesis without affecting host cells?
A. Presence of circular DNA
B. Smaller, structurally distinct ribosomes
C. Lack of membrane-bound organelles
D. Peptidoglycan cell wall
Answer: B. Bacterial ribosomes are 70S (30S + 50S subunits) and differ structurally from
eukaryotic 80S ribosomes. Aminoglycosides bind to the bacterial 30S ribosomal subunit,
inhibiting protein synthesis without affecting host cell ribosomes. Circular DNA is present in
bacteria but is not the antibiotic target. Peptidoglycan is targeted by β-lactam antibiotics, not
aminoglycosides.
Question 7. Which cellular organelle is responsible for ATP production through oxidative
phosphorylation?
A. Nucleus
B. Ribosome
C. Mitochondrion
,D. Lysosome
Answer: C. Mitochondria are the sites of oxidative phosphorylation and ATP production through
the electron transport chain and chemiosmosis. The nucleus houses genetic material,
ribosomes synthesize proteins, and lysosomes perform intracellular digestion.
Question 8. What is the primary function of the cell membrane's phospholipid bilayer?
A. Protein synthesis
B. Selective permeability and barrier function
C. ATP production
D. Genetic information storage
Answer: B. The phospholipid bilayer provides the fundamental structure of the cell membrane,
creating a selectively permeable barrier that regulates the passage of substances into and out of
the cell while maintaining cellular integrity.
Question 9. Which type of cell junction allows direct communication between adjacent cells
through connexons?
A. Tight junctions
B. Gap junctions
C. Desmosomes
D. Adherens junctions
Answer: B. Gap junctions contain connexons, which are channels that allow direct passage of
ions and small molecules between adjacent cells, facilitating electrical and metabolic coupling.
Tight junctions create impermeable barriers, desmosomes provide mechanical strength, and
adherens junctions mediate cell-cell adhesion.
Question 10. Which statement accurately describes the function of lysosomes?
A. They synthesize proteins for export.
B. They contain digestive enzymes that break down cellular debris.
C. They produce ATP through oxidative phosphorylation.
D. They synthesize lipids and steroids.
Answer: B. Lysosomes are membrane-bound organelles containing more than 40 digestive
enzymes (hydrolases) that catalyze the breakdown of proteins, lipids, nucleic acids, and
carbohydrates. They function as the intracellular digestive system, degrading worn-out
organelles and cellular debris.
Question 11. What is the role of the nucleolus within the cell?
A. ATP production
B. Synthesis of ribosomal RNA and assembly of ribosomes
C. Protein modification and packaging
D. Intracellular digestion
Answer: B. The nucleolus is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.
It is composed largely of RNA, DNA, and DNA-binding proteins. ATP production occurs in
, mitochondria, protein modification in the Golgi apparatus, and intracellular digestion in
lysosomes.
Question 12. Which cellular process involves the engulfment of large particles or
microorganisms by the cell membrane?
A. Pinocytosis
B. Phagocytosis
C. Receptor-mediated endocytosis
D. Exocytosis
Answer: B. Phagocytosis is the process by which cells engulf large particles, such as
microorganisms or cellular debris, through extension of the cell membrane (pseudopods).
Pinocytosis involves ingestion of fluid and small solutes. Receptor-mediated endocytosis is
specific uptake of ligands. Exocytosis is the release of materials from the cell.
Question 13. A patient's cells are exposed to a toxin that inhibits mitochondrial function. Which
cellular process would be most directly impaired?
A. Protein synthesis
B. Active transport
C. Phagocytosis
D. DNA replication
Answer: B. Active transport processes, such as the Na⁺/K⁺ ATPase pump, require ATP produced
by mitochondria. Without ATP, active transport fails, leading to loss of ionic gradients and
cellular swelling. Protein synthesis, phagocytosis, and DNA replication may be indirectly affected
but are not the most direct consequences of mitochondrial inhibition.
Question 14. Which component of the cytoskeleton is composed of tubulin subunits and is
involved in chromosome movement during cell division?
A. Microfilaments
B. Intermediate filaments
C. Microtubules
D. Actin filaments
Answer: C. Microtubules are composed of tubulin subunits and form the mitotic spindle, which
is essential for chromosome movement during cell division. Microfilaments (actin filaments) are
involved in cell movement and muscle contraction. Intermediate filaments provide mechanical
support.
Question 15. What is the primary mechanism by which cells communicate over long distances?
A. Gap junctions
B. Paracrine signaling
C. Endocrine signaling
D. Synaptic signaling
Answer: C. Endocrine signaling involves the release of hormones into the bloodstream, allowing
in Adults and Children (9th Edition) by Julia Rogers
Comprehensive 180-Question Multiple-Choice Examination with
Answers and Rationales
PART ONE: CENTRAL CONCEPTS OF PATHOPHYSIOLOGY: CELLS AND TISSUES
UNIT I: THE CELL
CHAPTER 1: CELLULAR BIOLOGY
Question 1. Which statement best describes the cellular function of metabolic absorption?
A. Cells can produce proteins.
B. Cells can secrete digestive enzymes.
C. Cells can take in and use nutrients.
D. Cells can synthesize fats.
Answer: C. In metabolic absorption, all cells take in and use nutrients and other substances
from their surroundings. This is a fundamental cellular function that enables cells to acquire raw
materials needed for growth, repair, and energy production. Protein production, enzyme
secretion, and fat synthesis are specialized functions, not the definition of metabolic absorption.
Question 2. Where is most of a cell's genetic information, including RNA and DNA, contained?
A. Mitochondria
B. Ribosome
C. Nucleolus
D. Lysosome
Answer: C. The nucleus contains the nucleolus, a small dense structure composed largely of
RNA, most of the cellular DNA, and DNA-binding proteins such as histones, which regulate its
activity. Mitochondria are responsible for cellular respiration and energy production. Ribosomes
provide sites for protein synthesis. Lysosomes function as the intracellular digestive system.
Question 3. Which component of the cell produces hydrogen peroxide (H₂O₂) by using oxygen
to remove hydrogen atoms from specific substrates in an oxidative reaction?
A. Lysosomes
B. Peroxisomes
C. Ribosomes
D. Endosomes
Answer: B. Peroxisomes contain enzymes that use oxygen to remove hydrogen atoms from
specific substrates in an oxidative reaction that produces H₂O₂, a powerful oxidant that can be
destructive if it accumulates or escapes. Ribosomes are RNA-protein complexes for protein
,synthesis. Lysosomes contain digestive enzymes. Endosomes are vesicles pinched off from the
cellular membrane.
Question 4. A patient with hypoxic tissue injury shows cellular swelling. Which failed cellular
function best explains this early change?
A. Mitochondrial DNA damage
B. Loss of Na⁺/K⁺ ATPase activity
C. Increased lysosomal enzyme release
D. Activation of caspases
Answer: B. The Na⁺/K⁺ ATPase pump maintains osmotic balance by actively transporting sodium
out of and potassium into cells. When ATP production is compromised during hypoxia, this
pump fails, allowing sodium to accumulate intracellularly, drawing water into the cell and
causing cellular swelling—the earliest manifestation of reversible cell injury.
Question 5. Which statement best describes the function of the Golgi apparatus?
A. Synthesis of ribosomal RNA
B. Packaging and modifying proteins for secretion
C. Production of adenosine triphosphate (ATP)
D. Intracellular digestion of worn-out organelles
Answer: B. The Golgi apparatus processes, packages, and modifies proteins and lipids
synthesized in the endoplasmic reticulum, preparing them for secretion or delivery to other
cellular destinations. Ribosomal RNA is synthesized in the nucleolus. ATP is produced in
mitochondria. Intracellular digestion occurs in lysosomes.
Question 6. A patient has a bacterial bloodstream infection. Which cellular feature of bacteria
most directly explains why aminoglycoside antibiotics selectively inhibit bacterial protein
synthesis without affecting host cells?
A. Presence of circular DNA
B. Smaller, structurally distinct ribosomes
C. Lack of membrane-bound organelles
D. Peptidoglycan cell wall
Answer: B. Bacterial ribosomes are 70S (30S + 50S subunits) and differ structurally from
eukaryotic 80S ribosomes. Aminoglycosides bind to the bacterial 30S ribosomal subunit,
inhibiting protein synthesis without affecting host cell ribosomes. Circular DNA is present in
bacteria but is not the antibiotic target. Peptidoglycan is targeted by β-lactam antibiotics, not
aminoglycosides.
Question 7. Which cellular organelle is responsible for ATP production through oxidative
phosphorylation?
A. Nucleus
B. Ribosome
C. Mitochondrion
,D. Lysosome
Answer: C. Mitochondria are the sites of oxidative phosphorylation and ATP production through
the electron transport chain and chemiosmosis. The nucleus houses genetic material,
ribosomes synthesize proteins, and lysosomes perform intracellular digestion.
Question 8. What is the primary function of the cell membrane's phospholipid bilayer?
A. Protein synthesis
B. Selective permeability and barrier function
C. ATP production
D. Genetic information storage
Answer: B. The phospholipid bilayer provides the fundamental structure of the cell membrane,
creating a selectively permeable barrier that regulates the passage of substances into and out of
the cell while maintaining cellular integrity.
Question 9. Which type of cell junction allows direct communication between adjacent cells
through connexons?
A. Tight junctions
B. Gap junctions
C. Desmosomes
D. Adherens junctions
Answer: B. Gap junctions contain connexons, which are channels that allow direct passage of
ions and small molecules between adjacent cells, facilitating electrical and metabolic coupling.
Tight junctions create impermeable barriers, desmosomes provide mechanical strength, and
adherens junctions mediate cell-cell adhesion.
Question 10. Which statement accurately describes the function of lysosomes?
A. They synthesize proteins for export.
B. They contain digestive enzymes that break down cellular debris.
C. They produce ATP through oxidative phosphorylation.
D. They synthesize lipids and steroids.
Answer: B. Lysosomes are membrane-bound organelles containing more than 40 digestive
enzymes (hydrolases) that catalyze the breakdown of proteins, lipids, nucleic acids, and
carbohydrates. They function as the intracellular digestive system, degrading worn-out
organelles and cellular debris.
Question 11. What is the role of the nucleolus within the cell?
A. ATP production
B. Synthesis of ribosomal RNA and assembly of ribosomes
C. Protein modification and packaging
D. Intracellular digestion
Answer: B. The nucleolus is the site of ribosomal RNA (rRNA) synthesis and ribosome assembly.
It is composed largely of RNA, DNA, and DNA-binding proteins. ATP production occurs in
, mitochondria, protein modification in the Golgi apparatus, and intracellular digestion in
lysosomes.
Question 12. Which cellular process involves the engulfment of large particles or
microorganisms by the cell membrane?
A. Pinocytosis
B. Phagocytosis
C. Receptor-mediated endocytosis
D. Exocytosis
Answer: B. Phagocytosis is the process by which cells engulf large particles, such as
microorganisms or cellular debris, through extension of the cell membrane (pseudopods).
Pinocytosis involves ingestion of fluid and small solutes. Receptor-mediated endocytosis is
specific uptake of ligands. Exocytosis is the release of materials from the cell.
Question 13. A patient's cells are exposed to a toxin that inhibits mitochondrial function. Which
cellular process would be most directly impaired?
A. Protein synthesis
B. Active transport
C. Phagocytosis
D. DNA replication
Answer: B. Active transport processes, such as the Na⁺/K⁺ ATPase pump, require ATP produced
by mitochondria. Without ATP, active transport fails, leading to loss of ionic gradients and
cellular swelling. Protein synthesis, phagocytosis, and DNA replication may be indirectly affected
but are not the most direct consequences of mitochondrial inhibition.
Question 14. Which component of the cytoskeleton is composed of tubulin subunits and is
involved in chromosome movement during cell division?
A. Microfilaments
B. Intermediate filaments
C. Microtubules
D. Actin filaments
Answer: C. Microtubules are composed of tubulin subunits and form the mitotic spindle, which
is essential for chromosome movement during cell division. Microfilaments (actin filaments) are
involved in cell movement and muscle contraction. Intermediate filaments provide mechanical
support.
Question 15. What is the primary mechanism by which cells communicate over long distances?
A. Gap junctions
B. Paracrine signaling
C. Endocrine signaling
D. Synaptic signaling
Answer: C. Endocrine signaling involves the release of hormones into the bloodstream, allowing
