Page 1 of 45
NR 507 FINAL EXAM – 2026 ADVANCED
PATHOPHYSIOLOGY COMPLETE (120) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH DETAILED
RATIONALES.
PATHOPHYSIOLOGY
Prepare effectively for the NR 507 Final Exam – Advanced Pathophysiology
Examination with this comprehensive study resource. This PDF covers essential
pathophysiology concepts, disease mechanisms, clinical correlations, and other key
topics to help reinforce your understanding of the course material. It is ideal for self-
paced learning, final review, and exam preparation. A valuable resource for students
looking to boost their confidence and maximize their readiness for the final
examination.
MULTIPLE CHOICE.
Section 1: Cellular Biology & Genetics (Questions 1–20)
1. Which cellular organelle is responsible for ATP production through
oxidative phosphorylation?
A) Ribosome
B) Golgi apparatus
C) Mitochondrion
D) Endoplasmic reticulum
Answer: C
Rationale: The mitochondrion is the site of aerobic respiration and ATP
synthesis via oxidative phosphorylation. Ribosomes synthesize proteins,
the Golgi modifies and packages proteins, and the ER is involved in
synthesis and transport.
2. A mutation that results in the substitution of one amino acid for another
in a protein is called a:
A) Silent mutation
, Page 2 of 45
B) Missense mutation
C) Nonsense mutation
D) Frameshift mutation
Answer: B
Rationale: A missense mutation changes a single nucleotide, resulting in
a codon that codes for a different amino acid. A silent mutation does not
change the amino acid; a nonsense mutation creates a premature stop
codon; a frameshift mutation alters the reading frame.
3. Which type of cell adaptation involves a decrease in cell size and
metabolic activity in response to decreased workload?
A) Hypertrophy
B) Hyperplasia
C) Atrophy
D) Metaplasia
Answer: C
Rationale: Atrophy is the shrinkage of cell size due to reduced demand,
disuse, denervation, or ischemia. Hypertrophy is an increase in cell size;
hyperplasia is increased cell number; metaplasia is the replacement of
one cell type with another.
4. In reversible cell injury, which of the following is the earliest
manifestation of cellular swelling?
A) Nuclear pyknosis
B) Loss of microvilli
C) Swelling of the endoplasmic reticulum and mitochondria
D) Rupture of the lysosomal membrane
Answer: C
Rationale: Cellular swelling (hydropic change) occurs when the Na+/K+
pump fails, leading to water influx and swelling of organelles—
particularly the ER and mitochondria. This is the earliest sign of reversible
injury.
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5. The term "apoptosis" refers to:
A) Uncontrolled, rapid cell division
B) Programmed cell death
C) Necrotic cell death due to trauma
D) Cellular adaptation to hypoxia
Answer: B
Rationale: Apoptosis is a highly regulated, energy-dependent process of
programmed cell death that eliminates damaged, infected, or unneeded
cells without triggering an inflammatory response. Necrosis is
unregulated and inflammatory.
6. Which genetic disorder is caused by a trinucleotide repeat expansion
(CAG) on chromosome 4?
A) Cystic fibrosis
B) Huntington disease
C) Duchenne muscular dystrophy
D) Down syndrome
Answer: B
Rationale: Huntington disease is an autosomal dominant disorder caused
by an expanded CAG repeat on chromosome 4, leading to progressive
neurodegeneration. Cystic fibrosis is a CFTR mutation; Duchenne is an X-
linked dystrophin mutation; Down syndrome is trisomy 21.
7. A patient with a family history of breast cancer is found to have a
mutation in the BRCA1 gene. This gene is classified as a:
A) Oncogene
B) Tumor suppressor gene
C) Proto-oncogene
D) DNA repair gene
, Page 4 of 45
Answer: B
Rationale: BRCA1 is a tumor suppressor gene; it normally functions to
repair DNA damage. Mutations in tumor suppressor genes lead to loss of
function and increased cancer risk. Oncogenes are gain-of-function
mutations.
8. Which cellular change is characteristic of malignant neoplasms?
A) Well-differentiated cells with normal mitotic figures
B) Anaplasia and loss of contact inhibition
C) Slow, localized growth
D) Encapsulation by fibrous tissue
Answer: B
Rationale: Malignant cells exhibit anaplasia (loss of differentiation) and
loss of contact inhibition, allowing them to grow invasively. Benign tumors
are well-differentiated, encapsulated, and grow slowly.
9. The cellular response to chronic hypoxia includes:
A) Decreased erythropoietin production
B) Increased glycolysis and lactic acid production
C) Increased oxidative phosphorylation
D) Decreased vascular endothelial growth factor (VEGF)
Answer: B
Rationale: In chronic hypoxia, cells shift to anaerobic glycolysis,
increasing lactic acid production to generate ATP. This is accompanied by
increased erythropoietin and VEGF to improve oxygen delivery.
10. Which phase of the cell cycle is characterized by DNA replication?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
NR 507 FINAL EXAM – 2026 ADVANCED
PATHOPHYSIOLOGY COMPLETE (120) CURRENT TESTING
QUESTIONS AND CORRECT ANSWERS WITH DETAILED
RATIONALES.
PATHOPHYSIOLOGY
Prepare effectively for the NR 507 Final Exam – Advanced Pathophysiology
Examination with this comprehensive study resource. This PDF covers essential
pathophysiology concepts, disease mechanisms, clinical correlations, and other key
topics to help reinforce your understanding of the course material. It is ideal for self-
paced learning, final review, and exam preparation. A valuable resource for students
looking to boost their confidence and maximize their readiness for the final
examination.
MULTIPLE CHOICE.
Section 1: Cellular Biology & Genetics (Questions 1–20)
1. Which cellular organelle is responsible for ATP production through
oxidative phosphorylation?
A) Ribosome
B) Golgi apparatus
C) Mitochondrion
D) Endoplasmic reticulum
Answer: C
Rationale: The mitochondrion is the site of aerobic respiration and ATP
synthesis via oxidative phosphorylation. Ribosomes synthesize proteins,
the Golgi modifies and packages proteins, and the ER is involved in
synthesis and transport.
2. A mutation that results in the substitution of one amino acid for another
in a protein is called a:
A) Silent mutation
, Page 2 of 45
B) Missense mutation
C) Nonsense mutation
D) Frameshift mutation
Answer: B
Rationale: A missense mutation changes a single nucleotide, resulting in
a codon that codes for a different amino acid. A silent mutation does not
change the amino acid; a nonsense mutation creates a premature stop
codon; a frameshift mutation alters the reading frame.
3. Which type of cell adaptation involves a decrease in cell size and
metabolic activity in response to decreased workload?
A) Hypertrophy
B) Hyperplasia
C) Atrophy
D) Metaplasia
Answer: C
Rationale: Atrophy is the shrinkage of cell size due to reduced demand,
disuse, denervation, or ischemia. Hypertrophy is an increase in cell size;
hyperplasia is increased cell number; metaplasia is the replacement of
one cell type with another.
4. In reversible cell injury, which of the following is the earliest
manifestation of cellular swelling?
A) Nuclear pyknosis
B) Loss of microvilli
C) Swelling of the endoplasmic reticulum and mitochondria
D) Rupture of the lysosomal membrane
Answer: C
Rationale: Cellular swelling (hydropic change) occurs when the Na+/K+
pump fails, leading to water influx and swelling of organelles—
particularly the ER and mitochondria. This is the earliest sign of reversible
injury.
, Page 3 of 45
5. The term "apoptosis" refers to:
A) Uncontrolled, rapid cell division
B) Programmed cell death
C) Necrotic cell death due to trauma
D) Cellular adaptation to hypoxia
Answer: B
Rationale: Apoptosis is a highly regulated, energy-dependent process of
programmed cell death that eliminates damaged, infected, or unneeded
cells without triggering an inflammatory response. Necrosis is
unregulated and inflammatory.
6. Which genetic disorder is caused by a trinucleotide repeat expansion
(CAG) on chromosome 4?
A) Cystic fibrosis
B) Huntington disease
C) Duchenne muscular dystrophy
D) Down syndrome
Answer: B
Rationale: Huntington disease is an autosomal dominant disorder caused
by an expanded CAG repeat on chromosome 4, leading to progressive
neurodegeneration. Cystic fibrosis is a CFTR mutation; Duchenne is an X-
linked dystrophin mutation; Down syndrome is trisomy 21.
7. A patient with a family history of breast cancer is found to have a
mutation in the BRCA1 gene. This gene is classified as a:
A) Oncogene
B) Tumor suppressor gene
C) Proto-oncogene
D) DNA repair gene
, Page 4 of 45
Answer: B
Rationale: BRCA1 is a tumor suppressor gene; it normally functions to
repair DNA damage. Mutations in tumor suppressor genes lead to loss of
function and increased cancer risk. Oncogenes are gain-of-function
mutations.
8. Which cellular change is characteristic of malignant neoplasms?
A) Well-differentiated cells with normal mitotic figures
B) Anaplasia and loss of contact inhibition
C) Slow, localized growth
D) Encapsulation by fibrous tissue
Answer: B
Rationale: Malignant cells exhibit anaplasia (loss of differentiation) and
loss of contact inhibition, allowing them to grow invasively. Benign tumors
are well-differentiated, encapsulated, and grow slowly.
9. The cellular response to chronic hypoxia includes:
A) Decreased erythropoietin production
B) Increased glycolysis and lactic acid production
C) Increased oxidative phosphorylation
D) Decreased vascular endothelial growth factor (VEGF)
Answer: B
Rationale: In chronic hypoxia, cells shift to anaerobic glycolysis,
increasing lactic acid production to generate ATP. This is accompanied by
increased erythropoietin and VEGF to improve oxygen delivery.
10. Which phase of the cell cycle is characterized by DNA replication?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
