NUR 555 ADVANCED CLINICAL
PATHOPHYSIOLOGY
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. A 55-year-old male with chronic hypertension exhibits left ventricular enlargement. Which
cellular adaptation is primarily responsible for this change?
A. Hyperplasia
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: C
Conceptual Explanation: Hypertrophy is an increase in the size of cells, common in
cardiac and skeletal muscle which cannot undergo mitosis. Hyperplasia involves an
increase in cell number, while metaplasia and dysplasia involve changes in cell type or
organization.
2. Which epigenetic mechanism involves the addition of a methyl group to a cytosine base,
typically leading to gene silencing?
A. Histone Acetylation
,B. DNA Methylation
C. RNA Interference
D. Chromatin Remodeling
Answer: B
Conceptual Explanation: DNA methylation occurs when a methyl group is attached to the
C5 position of the cytosine ring, which often prevents the binding of transcription factors,
thereby silencing the gene.
3. In Type III hypersensitivity reactions, what is the primary cause of tissue damage?
A. Deposition of immune complexes and complement activation
B. Cytotoxic T-cell mediated cell lysis
C. IgE-mediated mast cell degranulation
D. Antibody-dependent cell-mediated cytotoxicity (ADCC)
Answer: A
Conceptual Explanation: Type III hypersensitivity is mediated by the formation of
antigen-antibody (immune) complexes that deposit in tissues, leading to complement
activation and neutrophil recruitment, causing local damage.
4. The TP53 gene is considered a ‘guardian of the genome.’ Its loss of function primarily
contributes to cancer by:
A. Failing to initiate apoptosis or DNA repair in damaged cells
, B. Accelerating the cell cycle via growth factor mimicry
C. Increasing the length of telomeres indefinitely
D. Enhancing the secretion of vascular endothelial growth factor (VEGF)
Answer: A
Conceptual Explanation: p53 is a tumor suppressor protein that monitors DNA integrity;
if damage is detected, it triggers repair or apoptosis. Loss of TP53 allows damaged cells to
survive and proliferate.
5. What is the hallmark pathophysiological process in Multiple Sclerosis (MS)?
A. Autoimmune-mediated demyelination of the central nervous system
B. Depletion of dopamine in the substantia nigra
C. Accumulation of beta-amyloid plaques in the hippocampus
D. Degeneration of lower motor neurons in the spinal cord
Answer: A
Conceptual Explanation: MS is an autoimmune disease where T-cells cross the blood-
brain barrier and attack the myelin sheath surrounding axons in the CNS, leading to
impaired nerve conduction.
6. In Alzheimer’s disease, the presence of neurofibrillary tangles is primarily associated with
the abnormal phosphorylation of which protein?
A. Tau
PATHOPHYSIOLOGY
COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS
1. A 55-year-old male with chronic hypertension exhibits left ventricular enlargement. Which
cellular adaptation is primarily responsible for this change?
A. Hyperplasia
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: C
Conceptual Explanation: Hypertrophy is an increase in the size of cells, common in
cardiac and skeletal muscle which cannot undergo mitosis. Hyperplasia involves an
increase in cell number, while metaplasia and dysplasia involve changes in cell type or
organization.
2. Which epigenetic mechanism involves the addition of a methyl group to a cytosine base,
typically leading to gene silencing?
A. Histone Acetylation
,B. DNA Methylation
C. RNA Interference
D. Chromatin Remodeling
Answer: B
Conceptual Explanation: DNA methylation occurs when a methyl group is attached to the
C5 position of the cytosine ring, which often prevents the binding of transcription factors,
thereby silencing the gene.
3. In Type III hypersensitivity reactions, what is the primary cause of tissue damage?
A. Deposition of immune complexes and complement activation
B. Cytotoxic T-cell mediated cell lysis
C. IgE-mediated mast cell degranulation
D. Antibody-dependent cell-mediated cytotoxicity (ADCC)
Answer: A
Conceptual Explanation: Type III hypersensitivity is mediated by the formation of
antigen-antibody (immune) complexes that deposit in tissues, leading to complement
activation and neutrophil recruitment, causing local damage.
4. The TP53 gene is considered a ‘guardian of the genome.’ Its loss of function primarily
contributes to cancer by:
A. Failing to initiate apoptosis or DNA repair in damaged cells
, B. Accelerating the cell cycle via growth factor mimicry
C. Increasing the length of telomeres indefinitely
D. Enhancing the secretion of vascular endothelial growth factor (VEGF)
Answer: A
Conceptual Explanation: p53 is a tumor suppressor protein that monitors DNA integrity;
if damage is detected, it triggers repair or apoptosis. Loss of TP53 allows damaged cells to
survive and proliferate.
5. What is the hallmark pathophysiological process in Multiple Sclerosis (MS)?
A. Autoimmune-mediated demyelination of the central nervous system
B. Depletion of dopamine in the substantia nigra
C. Accumulation of beta-amyloid plaques in the hippocampus
D. Degeneration of lower motor neurons in the spinal cord
Answer: A
Conceptual Explanation: MS is an autoimmune disease where T-cells cross the blood-
brain barrier and attack the myelin sheath surrounding axons in the CNS, leading to
impaired nerve conduction.
6. In Alzheimer’s disease, the presence of neurofibrillary tangles is primarily associated with
the abnormal phosphorylation of which protein?
A. Tau
