Test Bank For Robbins, Cotran & Kumar Pathologic Basis of Disease,
11th Edition
Authors: Vinay Kumar,Abul K. Abbas,Jon C. Aster,Jayanta
Debnath,Abhijit Das
,Chapter 1. The Cell as a Unit of Health and Disease
Cotran & Kumar Pathologic Basis of Disease (11th Edition). All questions are original.
Multiple Choice Questions (15)
Theory MCQs (1–10)
Question 1
Which cellular organelle is primarily responsible for generating ATP through oxidative
phosphorylation while also playing a key role in regulating apoptosis?
A. Golgi apparatus
B. Lysosome
C. Mitochondrion
D. Rough endoplasmic reticulum
Correct Answer: C. Mitochondrion
Explanation
Mitochondria are the primary source of ATP through oxidative phosphorylation. In addition,
they regulate intrinsic apoptosis by releasing proteins such as cytochrome c in response to
cellular stress. They also participate in calcium homeostasis and production of reactive
oxygen species (ROS).
Why the other options are incorrect
• A. Golgi apparatus: Modifies, sorts, and packages proteins but does not generate
ATP or initiate intrinsic apoptosis.
• B. Lysosome: Contains hydrolytic enzymes for intracellular digestion and
autophagy rather than ATP synthesis.
• D. Rough endoplasmic reticulum: Synthesizes membrane-bound and secreted
proteins but is not responsible for oxidative phosphorylation.
Question 2
Which cytoskeletal component is primarily responsible for maintaining cell shape,
supporting intracellular transport, and forming the mitotic spindle?
,A. Actin microfilaments
B. Intermediate filaments
C. Microtubules
D. Myosin filaments
Correct Answer: C. Microtubules
Explanation
Microtubules are composed of α- and β-tubulin and participate in intracellular transport,
chromosome segregation during mitosis, maintenance of cell polarity, and ciliary
movement.
Incorrect options
• A. Actin microfilaments: Important for cell movement, contraction, and
cytokinesis but not spindle formation.
• B. Intermediate filaments: Provide tensile strength and structural stability without
participating in intracellular transport.
• D. Myosin filaments: Motor proteins that interact with actin but do not form the
mitotic spindle.
Question 3
A mutation affecting nuclear lamins would most directly impair which cellular function?
A. ATP production
B. Nuclear structural integrity
C. Protein glycosylation
D. Lipid degradation
Correct Answer: B. Nuclear structural integrity
Explanation
Nuclear lamins are intermediate filament proteins that maintain nuclear shape, organize
chromatin, and regulate DNA replication and transcription. Mutations can lead to
disorders affecting muscle, adipose tissue, and premature aging.
Incorrect options
• A: ATP is generated primarily in mitochondria.
• C: Glycosylation occurs mainly in the Golgi apparatus.
• D: Lipid degradation occurs mainly in lysosomes and peroxisomes.
, Question 4
The primary function of molecular chaperone proteins is to:
A. Initiate apoptosis
B. Facilitate proper protein folding
C. Degrade DNA fragments
D. Produce ATP
Correct Answer: B. Facilitate proper protein folding
Explanation
Molecular chaperones assist newly synthesized proteins in achieving their correct three-
dimensional structure and help refold damaged proteins during cellular stress.
Incorrect options
• A: Apoptosis is regulated by signaling pathways, not directly by chaperones.
• C: DNA degradation is mediated by nucleases.
• D: ATP synthesis occurs in mitochondria.
Question 5
Cells maintain internal stability despite external environmental changes primarily through:
A. Necrosis
B. Homeostasis
C. Hyperplasia
D. Differentiation
Correct Answer: B. Homeostasis
Explanation
Homeostasis refers to the maintenance of a stable internal environment through
coordinated regulation of cellular metabolism, signaling, and gene expression.
Incorrect options
• A: Necrosis is uncontrolled cell death.
• C: Hyperplasia is increased cell number.
• D: Differentiation is specialization of cells.
11th Edition
Authors: Vinay Kumar,Abul K. Abbas,Jon C. Aster,Jayanta
Debnath,Abhijit Das
,Chapter 1. The Cell as a Unit of Health and Disease
Cotran & Kumar Pathologic Basis of Disease (11th Edition). All questions are original.
Multiple Choice Questions (15)
Theory MCQs (1–10)
Question 1
Which cellular organelle is primarily responsible for generating ATP through oxidative
phosphorylation while also playing a key role in regulating apoptosis?
A. Golgi apparatus
B. Lysosome
C. Mitochondrion
D. Rough endoplasmic reticulum
Correct Answer: C. Mitochondrion
Explanation
Mitochondria are the primary source of ATP through oxidative phosphorylation. In addition,
they regulate intrinsic apoptosis by releasing proteins such as cytochrome c in response to
cellular stress. They also participate in calcium homeostasis and production of reactive
oxygen species (ROS).
Why the other options are incorrect
• A. Golgi apparatus: Modifies, sorts, and packages proteins but does not generate
ATP or initiate intrinsic apoptosis.
• B. Lysosome: Contains hydrolytic enzymes for intracellular digestion and
autophagy rather than ATP synthesis.
• D. Rough endoplasmic reticulum: Synthesizes membrane-bound and secreted
proteins but is not responsible for oxidative phosphorylation.
Question 2
Which cytoskeletal component is primarily responsible for maintaining cell shape,
supporting intracellular transport, and forming the mitotic spindle?
,A. Actin microfilaments
B. Intermediate filaments
C. Microtubules
D. Myosin filaments
Correct Answer: C. Microtubules
Explanation
Microtubules are composed of α- and β-tubulin and participate in intracellular transport,
chromosome segregation during mitosis, maintenance of cell polarity, and ciliary
movement.
Incorrect options
• A. Actin microfilaments: Important for cell movement, contraction, and
cytokinesis but not spindle formation.
• B. Intermediate filaments: Provide tensile strength and structural stability without
participating in intracellular transport.
• D. Myosin filaments: Motor proteins that interact with actin but do not form the
mitotic spindle.
Question 3
A mutation affecting nuclear lamins would most directly impair which cellular function?
A. ATP production
B. Nuclear structural integrity
C. Protein glycosylation
D. Lipid degradation
Correct Answer: B. Nuclear structural integrity
Explanation
Nuclear lamins are intermediate filament proteins that maintain nuclear shape, organize
chromatin, and regulate DNA replication and transcription. Mutations can lead to
disorders affecting muscle, adipose tissue, and premature aging.
Incorrect options
• A: ATP is generated primarily in mitochondria.
• C: Glycosylation occurs mainly in the Golgi apparatus.
• D: Lipid degradation occurs mainly in lysosomes and peroxisomes.
, Question 4
The primary function of molecular chaperone proteins is to:
A. Initiate apoptosis
B. Facilitate proper protein folding
C. Degrade DNA fragments
D. Produce ATP
Correct Answer: B. Facilitate proper protein folding
Explanation
Molecular chaperones assist newly synthesized proteins in achieving their correct three-
dimensional structure and help refold damaged proteins during cellular stress.
Incorrect options
• A: Apoptosis is regulated by signaling pathways, not directly by chaperones.
• C: DNA degradation is mediated by nucleases.
• D: ATP synthesis occurs in mitochondria.
Question 5
Cells maintain internal stability despite external environmental changes primarily through:
A. Necrosis
B. Homeostasis
C. Hyperplasia
D. Differentiation
Correct Answer: B. Homeostasis
Explanation
Homeostasis refers to the maintenance of a stable internal environment through
coordinated regulation of cellular metabolism, signaling, and gene expression.
Incorrect options
• A: Necrosis is uncontrolled cell death.
• C: Hyperplasia is increased cell number.
• D: Differentiation is specialization of cells.
