Western Governors University
MAXE • 511D
WGU College of Health Professions — Leavitt School of Health
A NEW KIND OF U.
D115 PATHO
D115 — Advanced Pathophysiology
CO M P R E H E N S I V E O A R E A D I N E SS E X A M I N AT I O N
INSTITUTION Western Governors University (WGU) COURSE CODE D115
PROGRAM M.S.N. — Family Nurse Practitioner (FNP) ACADEMIC YEAR
EXAM TITLE D115 Advanced Pathophysiology — TOTAL QUESTIONS 40 Questions
Comprehensive Exam
FORMAT Multiple Choice — Select the Single Best
Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question based on D115 Advanced Pathophysiology content.
▸ Questions cover genetics, cellular adaptation, immunity, neurology, endocrinology, pulmonology, cardiology, hematology,
nephrology, musculoskeletal, and dermatology.
▸ Pay close attention to pathognomonic findings, laboratory values, and distinguishing features between similar conditions.
▸ Correct answers and detailed rationales appear below each question for OA preparation.
SECTION I — MULTISYSTEM ADVANCED PATHOPHYSIOLOGY Questions 1 – 40
1. What is epigenetics?
A. Permanent changes in the DNA sequence that alter protein structure
B. Changes in gene expression that do not involve alterations in the DNA sequence (e.g., methylation, histone
modification)
C. The process by which genetic information is used to synthesize proteins
D. A common genetic variation that does not cause disease
CORRECT ANSWER B — Changes in gene expression without alterations in the DNA sequence
RATIONALE Epigenetics refers to heritable changes in GENE EXPRESSION that do NOT involve changes to the underlying
DNA sequence. Key epigenetic mechanisms include DNA methylation (addition of methyl groups to DNA,
typically silencing gene expression), histone modification (acetylation, methylation of histone proteins that
alter chromatin structure and gene accessibility), and non-coding RNAs. Epigenetic changes are heavily
influenced by environmental factors — diet, stress, smoking, toxins, and exercise can activate or suppress
genes through these mechanisms. Epigenetics explains how identical twins with the same DNA can develop
different diseases, and how environmental exposures can have lifelong and even transgenerational health
effects. A mutation (A) is a permanent change in DNA sequence. Gene expression (C) is the process by which
genes are transcribed and translated. A polymorphism (D) is a common genetic variation.
,2. What is the difference between atrophy and hypertrophy?
A. Atrophy: increase in cell number. Hypertrophy: decrease in cell size
B. Atrophy: decrease in cell size due to decreased workload/nutrition/blood supply. Hypertrophy: increase in cell size
due to increased workload
C. Both describe the same cellular adaptation
D. Atrophy: reversible cell replacement. Hypertrophy: irreversible cell death
CORRECT ANSWER B — Atrophy: decreased cell size from decreased workload. Hypertrophy: increased cell size from
increased workload
RATIONALE Atrophy and hypertrophy are opposite cellular adaptations. ATROPHY is a DECREASE in cell size (and
consequently organ size) due to decreased workload, decreased nutrition, decreased blood supply, or loss of
innervation. Examples: skeletal muscle atrophy from immobilization, brain atrophy in Alzheimer's disease.
HYPERTROPHY is an INCREASE in cell size due to increased workload or hormonal stimulation. Examples: left
ventricular hypertrophy from chronic hypertension, skeletal muscle hypertrophy from weight training. Both
are REVERSIBLE if the stimulus is removed. Other cellular adaptations: Hyperplasia (increase in cell number —
e.g., endometrial proliferation from estrogen), Metaplasia (reversible replacement of one mature cell type
with another — e.g., Barrett's esophagus), Dysplasia (abnormal cell growth with disordered structure —
precancerous). Apoptosis is programmed, non-inflammatory cell death; necrosis is uncontrolled cell death
with inflammation.
3. What is the difference between innate and adaptive immunity?
A. Innate: specific, learned, involves memory. Adaptive: nonspecific, immediate, present at birth
B. Innate: nonspecific, immediate defense present at birth. Adaptive: specific, learned immune responses involving
memory (T cells and B cells)
C. Both are identical in mechanism
D. Innate involves antibodies only; adaptive involves cells only
CORRECT ANSWER B — Innate: nonspecific, immediate, present at birth. Adaptive: specific, learned, involves memory
RATIONALE The immune system has two complementary branches. INNATE immunity is nonspecific, immediate, and
present at birth — it includes physical barriers (skin, mucous membranes), granulocytes (neutrophils,
eosinophils, basophils), mast cells, natural killer (NK) cells, complement proteins, and antigen-presenting
cells (dendritic cells, macrophages). It does NOT develop immunological memory. ADAPTIVE immunity is
specific, learned, and develops memory — it includes B lymphocytes (humoral immunity — produce
antibodies) and T lymphocytes (cell-mediated immunity — CD4+ helper, CD8+ cytotoxic, T regulatory). The
adaptive response is slower on first exposure but rapid and robust on subsequent exposures. The five
antibody classes: IgG (most abundant, crosses placenta, long-term immunity), IgA (mucosal secretions), IgM
(first produced in immune response), IgE (allergic reactions, parasites), IgD (B cell receptor).
, 4. Which hypersensitivity reaction causes anaphylaxis?
A. Type I (IgE-mediated immediate hypersensitivity)
B. Type II (IgG/IgM cytotoxic hypersensitivity)
C. Type III (Immune complex-mediated hypersensitivity)
D. Type IV (T-cell mediated delayed hypersensitivity)
CORRECT ANSWER A — Type I (IgE-mediated immediate hypersensitivity)
RATIONALE Type I (Immediate) Hypersensitivity is mediated by IgE antibodies bound to mast cells and basophils. Upon
re-exposure to the allergen, cross-linking of IgE triggers mast cell degranulation, releasing histamine,
leukotrienes, prostaglandins, and other vasoactive mediators within minutes. This causes vasodilation,
increased capillary permeability, bronchoconstriction, and mucus production. Manifestations range from
mild (urticaria, allergic rhinitis) to life-threatening (ANAPHYLAXIS — airway edema, hypotension, shock).
Treatment: epinephrine IM (first-line). Type II (B): antibody-mediated cytotoxicity (e.g., hemolytic anemia,
Myasthenia Gravis). Type III (C): immune complex deposition (e.g., SLE, post-streptococcal
glomerulonephritis). Type IV (D): delayed T-cell mediated (e.g., contact dermatitis, TB skin test, transplant
rejection). The "4 T's" for Type IV: T cells, Transplant rejection, TB test, Touching (contact dermatitis).
5. What is the pathophysiologic hallmark of Alzheimer disease?
A. Demyelination of CNS neurons
B. Dopamine depletion in the substantia nigra
C. Beta-amyloid plaques and neurofibrillary tangles
D. Autoimmune destruction of acetylcholine receptors
CORRECT ANSWER C — Beta-amyloid plaques and neurofibrillary tangles
RATIONALE Alzheimer disease is a progressive neurodegenerative disorder and the most common cause of dementia. The
pathologic hallmarks are: (1) Extracellular BETA-AMYLOID (Aβ) PLAQUES — accumulation of insoluble
amyloid-beta peptide fragments derived from abnormal cleavage of amyloid precursor protein (APP); these
plaques are neurotoxic and trigger inflammation. (2) Intracellular NEUROFIBRILLARY TANGLES — aggregates
of hyperphosphorylated TAU protein that disrupt microtubule function and neuronal transport. These
changes lead to synaptic loss, neuronal death, and progressive brain atrophy (particularly in the
hippocampus and cerebral cortex). Clinical progression: memory loss → language difficulties → visuospatial
deficits → loss of executive function → complete dependence. Demyelination (A) is Multiple Sclerosis.
Dopamine depletion (B) is Parkinson disease. ACh receptor destruction (D) is Myasthenia Gravis.
MAXE • 511D
WGU College of Health Professions — Leavitt School of Health
A NEW KIND OF U.
D115 PATHO
D115 — Advanced Pathophysiology
CO M P R E H E N S I V E O A R E A D I N E SS E X A M I N AT I O N
INSTITUTION Western Governors University (WGU) COURSE CODE D115
PROGRAM M.S.N. — Family Nurse Practitioner (FNP) ACADEMIC YEAR
EXAM TITLE D115 Advanced Pathophysiology — TOTAL QUESTIONS 40 Questions
Comprehensive Exam
FORMAT Multiple Choice — Select the Single Best
Answer
EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question based on D115 Advanced Pathophysiology content.
▸ Questions cover genetics, cellular adaptation, immunity, neurology, endocrinology, pulmonology, cardiology, hematology,
nephrology, musculoskeletal, and dermatology.
▸ Pay close attention to pathognomonic findings, laboratory values, and distinguishing features between similar conditions.
▸ Correct answers and detailed rationales appear below each question for OA preparation.
SECTION I — MULTISYSTEM ADVANCED PATHOPHYSIOLOGY Questions 1 – 40
1. What is epigenetics?
A. Permanent changes in the DNA sequence that alter protein structure
B. Changes in gene expression that do not involve alterations in the DNA sequence (e.g., methylation, histone
modification)
C. The process by which genetic information is used to synthesize proteins
D. A common genetic variation that does not cause disease
CORRECT ANSWER B — Changes in gene expression without alterations in the DNA sequence
RATIONALE Epigenetics refers to heritable changes in GENE EXPRESSION that do NOT involve changes to the underlying
DNA sequence. Key epigenetic mechanisms include DNA methylation (addition of methyl groups to DNA,
typically silencing gene expression), histone modification (acetylation, methylation of histone proteins that
alter chromatin structure and gene accessibility), and non-coding RNAs. Epigenetic changes are heavily
influenced by environmental factors — diet, stress, smoking, toxins, and exercise can activate or suppress
genes through these mechanisms. Epigenetics explains how identical twins with the same DNA can develop
different diseases, and how environmental exposures can have lifelong and even transgenerational health
effects. A mutation (A) is a permanent change in DNA sequence. Gene expression (C) is the process by which
genes are transcribed and translated. A polymorphism (D) is a common genetic variation.
,2. What is the difference between atrophy and hypertrophy?
A. Atrophy: increase in cell number. Hypertrophy: decrease in cell size
B. Atrophy: decrease in cell size due to decreased workload/nutrition/blood supply. Hypertrophy: increase in cell size
due to increased workload
C. Both describe the same cellular adaptation
D. Atrophy: reversible cell replacement. Hypertrophy: irreversible cell death
CORRECT ANSWER B — Atrophy: decreased cell size from decreased workload. Hypertrophy: increased cell size from
increased workload
RATIONALE Atrophy and hypertrophy are opposite cellular adaptations. ATROPHY is a DECREASE in cell size (and
consequently organ size) due to decreased workload, decreased nutrition, decreased blood supply, or loss of
innervation. Examples: skeletal muscle atrophy from immobilization, brain atrophy in Alzheimer's disease.
HYPERTROPHY is an INCREASE in cell size due to increased workload or hormonal stimulation. Examples: left
ventricular hypertrophy from chronic hypertension, skeletal muscle hypertrophy from weight training. Both
are REVERSIBLE if the stimulus is removed. Other cellular adaptations: Hyperplasia (increase in cell number —
e.g., endometrial proliferation from estrogen), Metaplasia (reversible replacement of one mature cell type
with another — e.g., Barrett's esophagus), Dysplasia (abnormal cell growth with disordered structure —
precancerous). Apoptosis is programmed, non-inflammatory cell death; necrosis is uncontrolled cell death
with inflammation.
3. What is the difference between innate and adaptive immunity?
A. Innate: specific, learned, involves memory. Adaptive: nonspecific, immediate, present at birth
B. Innate: nonspecific, immediate defense present at birth. Adaptive: specific, learned immune responses involving
memory (T cells and B cells)
C. Both are identical in mechanism
D. Innate involves antibodies only; adaptive involves cells only
CORRECT ANSWER B — Innate: nonspecific, immediate, present at birth. Adaptive: specific, learned, involves memory
RATIONALE The immune system has two complementary branches. INNATE immunity is nonspecific, immediate, and
present at birth — it includes physical barriers (skin, mucous membranes), granulocytes (neutrophils,
eosinophils, basophils), mast cells, natural killer (NK) cells, complement proteins, and antigen-presenting
cells (dendritic cells, macrophages). It does NOT develop immunological memory. ADAPTIVE immunity is
specific, learned, and develops memory — it includes B lymphocytes (humoral immunity — produce
antibodies) and T lymphocytes (cell-mediated immunity — CD4+ helper, CD8+ cytotoxic, T regulatory). The
adaptive response is slower on first exposure but rapid and robust on subsequent exposures. The five
antibody classes: IgG (most abundant, crosses placenta, long-term immunity), IgA (mucosal secretions), IgM
(first produced in immune response), IgE (allergic reactions, parasites), IgD (B cell receptor).
, 4. Which hypersensitivity reaction causes anaphylaxis?
A. Type I (IgE-mediated immediate hypersensitivity)
B. Type II (IgG/IgM cytotoxic hypersensitivity)
C. Type III (Immune complex-mediated hypersensitivity)
D. Type IV (T-cell mediated delayed hypersensitivity)
CORRECT ANSWER A — Type I (IgE-mediated immediate hypersensitivity)
RATIONALE Type I (Immediate) Hypersensitivity is mediated by IgE antibodies bound to mast cells and basophils. Upon
re-exposure to the allergen, cross-linking of IgE triggers mast cell degranulation, releasing histamine,
leukotrienes, prostaglandins, and other vasoactive mediators within minutes. This causes vasodilation,
increased capillary permeability, bronchoconstriction, and mucus production. Manifestations range from
mild (urticaria, allergic rhinitis) to life-threatening (ANAPHYLAXIS — airway edema, hypotension, shock).
Treatment: epinephrine IM (first-line). Type II (B): antibody-mediated cytotoxicity (e.g., hemolytic anemia,
Myasthenia Gravis). Type III (C): immune complex deposition (e.g., SLE, post-streptococcal
glomerulonephritis). Type IV (D): delayed T-cell mediated (e.g., contact dermatitis, TB skin test, transplant
rejection). The "4 T's" for Type IV: T cells, Transplant rejection, TB test, Touching (contact dermatitis).
5. What is the pathophysiologic hallmark of Alzheimer disease?
A. Demyelination of CNS neurons
B. Dopamine depletion in the substantia nigra
C. Beta-amyloid plaques and neurofibrillary tangles
D. Autoimmune destruction of acetylcholine receptors
CORRECT ANSWER C — Beta-amyloid plaques and neurofibrillary tangles
RATIONALE Alzheimer disease is a progressive neurodegenerative disorder and the most common cause of dementia. The
pathologic hallmarks are: (1) Extracellular BETA-AMYLOID (Aβ) PLAQUES — accumulation of insoluble
amyloid-beta peptide fragments derived from abnormal cleavage of amyloid precursor protein (APP); these
plaques are neurotoxic and trigger inflammation. (2) Intracellular NEUROFIBRILLARY TANGLES — aggregates
of hyperphosphorylated TAU protein that disrupt microtubule function and neuronal transport. These
changes lead to synaptic loss, neuronal death, and progressive brain atrophy (particularly in the
hippocampus and cerebral cortex). Clinical progression: memory loss → language difficulties → visuospatial
deficits → loss of executive function → complete dependence. Demyelination (A) is Multiple Sclerosis.
Dopamine depletion (B) is Parkinson disease. ACh receptor destruction (D) is Myasthenia Gravis.
