Page 1 of 67
DAVIS ADVANTAGE FOR PATHOPHYSIOLOGY EXAM WITH
VERIFIED ANSWERS DETAILED RATIONALES GRADED A+
Davis Advantage for Pathophysiology — Test Bank
SECTION 1: THE CELL IN HEALTH AND ILLNESS (Questions 1–30)
1. Which organelle is primarily responsible for energy production in the cell?
A. Nucleus
B. Ribosome
C. Mitochondrion
D. Golgi apparatus
Correct Answer: C
Rationale: Mitochondria generate ATP through cellular respiration, providing energy for cellular
functions. Other organelles serve different roles, such as protein synthesis or genetic regulation.
2. The plasma membrane's main function is to:
A. Store genetic material
B. Control the passage of substances into and out of the cell
C. Produce proteins
D. Digest cellular waste
Correct Answer: B
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Rationale: The plasma membrane regulates selective permeability, maintaining homeostasis.
The nucleus stores DNA, ribosomes synthesize proteins, and lysosomes handle waste digestion.
3. Which process moves substances from high to low concentration without energy use?
A. Active transport
B. Osmosis
C. Facilitated diffusion
D. Both B and C
Correct Answer: D
Rationale: Osmosis (water) and facilitated diffusion (molecules via transport proteins) are
passive processes. Active transport requires energy to move against a gradient.
4. Which statement regarding the sodium-potassium pump is correct?
A. The plasma membrane is more soluble to sodium ions than to potassium ions.
B. The concentration of sodium ions is higher inside the cell than outside.
C. The concentration of potassium ions is higher outside the cell than inside.
D. Three sodium ions are pumped out, and two potassium ions are pumped in.
Correct Answer: D
Rationale: The Na⁺/K⁺-ATPase actively transports three Na⁺ ions out of the cell and two K⁺ ions
in, maintaining gradients essential for cell function.
5. What is the process in which glucose is used to create energy in the cell?
A. Autolysis
B. Glycolysis
C. Heterolysis
D. None of the above
Correct Answer: B
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Rationale: Glycolysis is the metabolic pathway where glucose is broken down to produce ATP,
under both aerobic and anaerobic conditions.
6. How many ATP molecules are produced in aerobic metabolism?
A. 2
B. 3
C. 34
D. None of the above
Correct Answer: C
Rationale: Aerobic metabolism produces approximately 34 ATP molecules per glucose molecule,
compared to only 2 ATP in anaerobic glycolysis.
7. Which cell organelles are believed to have once been self-sustaining and independent?
A. Ribosomes
B. Mitochondria
C. Ribonucleic acid
D. Deoxyribonucleic acid
Correct Answer: B
Rationale: Mitochondria are believed to have originated from independent prokaryotic
organisms through endosymbiosis, as they contain their own DNA and ribosomes.
8. When does ribosomal protein synthesis cease?
A. During endoplasmic reticulum (ER) stress
B. During the synthesis of ATP
C. During severe hypoxic state
D. During the processing of prohormone
Correct Answer: C
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Rationale: During severe hypoxia, ATP production is impaired, and ribosomal protein synthesis
ceases because protein synthesis is an energy-dependent process.
9. The cellular organelle responsible for propelling mucous and inhaled debris out of the lungs
is:
A. Cilia
B. Microfilament
C. Secretory vesicle
D. Endoplasmic reticulum
Correct Answer: A
Rationale: Cilia are hair-like projections on respiratory epithelial cells that beat in coordinated
waves to move mucus and trapped particles toward the pharynx (mucociliary clearance).
10. Which are the key proteins in the contractile units of the muscle cells?
A. Actin and myosin
B. Myosin and tubulin
C. Tubulin and actin
D. Myosin and prohormone
Correct Answer: A
Rationale: Actin (thin filaments) and myosin (thick filaments) are the key contractile proteins in
muscle cells.
11. What is the primary function of the ribosome?
A. ATP production
B. Protein synthesis
C. Lipid synthesis
D. DNA replication
Correct Answer: B
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DAVIS ADVANTAGE FOR PATHOPHYSIOLOGY EXAM WITH
VERIFIED ANSWERS DETAILED RATIONALES GRADED A+
Davis Advantage for Pathophysiology — Test Bank
SECTION 1: THE CELL IN HEALTH AND ILLNESS (Questions 1–30)
1. Which organelle is primarily responsible for energy production in the cell?
A. Nucleus
B. Ribosome
C. Mitochondrion
D. Golgi apparatus
Correct Answer: C
Rationale: Mitochondria generate ATP through cellular respiration, providing energy for cellular
functions. Other organelles serve different roles, such as protein synthesis or genetic regulation.
2. The plasma membrane's main function is to:
A. Store genetic material
B. Control the passage of substances into and out of the cell
C. Produce proteins
D. Digest cellular waste
Correct Answer: B
1|Page
,Page 2 of 67
Rationale: The plasma membrane regulates selective permeability, maintaining homeostasis.
The nucleus stores DNA, ribosomes synthesize proteins, and lysosomes handle waste digestion.
3. Which process moves substances from high to low concentration without energy use?
A. Active transport
B. Osmosis
C. Facilitated diffusion
D. Both B and C
Correct Answer: D
Rationale: Osmosis (water) and facilitated diffusion (molecules via transport proteins) are
passive processes. Active transport requires energy to move against a gradient.
4. Which statement regarding the sodium-potassium pump is correct?
A. The plasma membrane is more soluble to sodium ions than to potassium ions.
B. The concentration of sodium ions is higher inside the cell than outside.
C. The concentration of potassium ions is higher outside the cell than inside.
D. Three sodium ions are pumped out, and two potassium ions are pumped in.
Correct Answer: D
Rationale: The Na⁺/K⁺-ATPase actively transports three Na⁺ ions out of the cell and two K⁺ ions
in, maintaining gradients essential for cell function.
5. What is the process in which glucose is used to create energy in the cell?
A. Autolysis
B. Glycolysis
C. Heterolysis
D. None of the above
Correct Answer: B
2|Page
,Page 3 of 67
Rationale: Glycolysis is the metabolic pathway where glucose is broken down to produce ATP,
under both aerobic and anaerobic conditions.
6. How many ATP molecules are produced in aerobic metabolism?
A. 2
B. 3
C. 34
D. None of the above
Correct Answer: C
Rationale: Aerobic metabolism produces approximately 34 ATP molecules per glucose molecule,
compared to only 2 ATP in anaerobic glycolysis.
7. Which cell organelles are believed to have once been self-sustaining and independent?
A. Ribosomes
B. Mitochondria
C. Ribonucleic acid
D. Deoxyribonucleic acid
Correct Answer: B
Rationale: Mitochondria are believed to have originated from independent prokaryotic
organisms through endosymbiosis, as they contain their own DNA and ribosomes.
8. When does ribosomal protein synthesis cease?
A. During endoplasmic reticulum (ER) stress
B. During the synthesis of ATP
C. During severe hypoxic state
D. During the processing of prohormone
Correct Answer: C
3|Page
, Page 4 of 67
Rationale: During severe hypoxia, ATP production is impaired, and ribosomal protein synthesis
ceases because protein synthesis is an energy-dependent process.
9. The cellular organelle responsible for propelling mucous and inhaled debris out of the lungs
is:
A. Cilia
B. Microfilament
C. Secretory vesicle
D. Endoplasmic reticulum
Correct Answer: A
Rationale: Cilia are hair-like projections on respiratory epithelial cells that beat in coordinated
waves to move mucus and trapped particles toward the pharynx (mucociliary clearance).
10. Which are the key proteins in the contractile units of the muscle cells?
A. Actin and myosin
B. Myosin and tubulin
C. Tubulin and actin
D. Myosin and prohormone
Correct Answer: A
Rationale: Actin (thin filaments) and myosin (thick filaments) are the key contractile proteins in
muscle cells.
11. What is the primary function of the ribosome?
A. ATP production
B. Protein synthesis
C. Lipid synthesis
D. DNA replication
Correct Answer: B
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