NR507 Advanced Pathophysiology Midterm
Practice Exam with questions and answers
with rationales (2026)
Instructions: Choose the best answer for each question. Rationales are
provided below each question.
1. A patient presents with a fever, a shift to the left in their white blood cell differential, and
elevated CRP. Which of the following best describes the primary purpose of the inflammatory
response?
A. To provide long-term, specific immunity against a pathogen
B. To neutralize, control, or eliminate the offending agent and prepare the site for healing
C. To induce a state of tolerance to prevent autoimmune reactions
D. To decrease vascular permeability and limit blood loss
Answer: B
Rationale: The inflammatory response is a non-specific, immediate reaction to tissue injury or
infection. Its primary goals are to neutralize and destroy the offending agent (e.g., pathogen,
toxin), remove debris, and initiate the healing process. A "shift to the left" indicates an increase
in immature neutrophils (bands), which are being rapidly released from the bone marrow to fight
infection. Option A describes adaptive immunity. Option C describes immune tolerance. Option
D is incorrect as inflammation increases vascular permeability to allow immune cells and
proteins into the tissue.
,2. A 65-year-old male with a history of chronic smoking presents with a persistent cough and
weight loss. A biopsy of a lung mass reveals cells with a high nuclear-to-cytoplasmic ratio,
hyperchromasia, and pleomorphism. These findings are most characteristic of:
A. Atrophy
B. Metaplasia
C. Dysplasia
D. Anaplasia
Answer: D
Rationale: Anaplasia is the hallmark of malignancy. It refers to a loss of cellular differentiation
and structural organization. Key features include pleomorphism (variation in cell size and shape),
hyperchromasia (darkly stained nuclei due to increased DNA), a high nuclear-to-cytoplasmic
ratio, and prominent nucleoli. Atrophy is a decrease in cell size. Metaplasia is the reversible
replacement of one mature cell type with another. Dysplasia refers to disordered growth and is a
precursor to malignancy, but anaplasia denotes the full malignant state.
3. Which of the following is the primary mechanism by which oncogenes contribute to the
development of cancer?
A. They are tumor suppressor genes that are inactivated.
B. They are normal genes that become overactive due to mutation.
C. They are involved in DNA repair mechanisms.
D. They are responsible for programmed cell death (apoptosis).
Answer: B
Rationale: Oncogenes are mutated versions of normal cellular genes called proto-oncogenes.
Proto-oncogenes normally promote controlled cell growth and division. When they acquire a
"gain-of-function" mutation, they become oncogenes, which drive excessive and uncontrolled
cell proliferation. Tumor suppressor genes (like p53 and Rb) are the ones that are inactivated
(Option A). Genes involved in DNA repair (Option C) and apoptosis (Option D) are also often
mutated in cancer, but the direct driving mechanism of oncogenes is overactivity.
,4. A patient with a severe bacterial infection develops septic shock. Which of the following
pathophysiological changes is most likely responsible for the hypotension observed in this
patient?
A. Massive vasoconstriction and increased systemic vascular resistance
B. Decreased production of nitric oxide (NO)
C. Widespread vasodilation and increased vascular permeability
D. Increased cardiac output due to sympathetic stimulation
Answer: C
Rationale: Septic shock is a form of distributive shock. The underlying pathophysiology involves
a massive systemic inflammatory response to infection. This leads to the release of inflammatory
mediators (like cytokines) that cause widespread vasodilation (decreasing systemic vascular
resistance) and increased capillary permeability (leading to fluid leakage into tissues). The result
is profound hypotension that is often unresponsive to fluid resuscitation alone. Option A is
characteristic of cardiogenic or hypovolemic shock. Option B is incorrect; NO is a potent
vasodilator and its production is often increased in sepsis.
5. Which of the following best describes the process of apoptosis?
A. Passive cell death due to severe injury, leading to inflammation
B. Programmed cell death that is energy-dependent and does not cause inflammation
C. Uncontrolled cell proliferation resulting in a tumor mass
D. Cell death due to hypoxia, resulting in cellular swelling and rupture
Answer: B
Rationale: Apoptosis is a form of programmed cell death that is a normal, regulated part of
growth and development, and it also serves to eliminate damaged or unwanted cells. It is an
active, energy (ATP)-dependent process. A key feature is that it does not incite an inflammatory
response because the cell membrane remains intact, and the cell breaks into apoptotic bodies that
, are quickly phagocytosed. Option A describes necrosis. Option C describes neoplasia. Option D
describes a common form of necrosis (e.g., ischemic cell death).
6. A child is diagnosed with DiGeorge syndrome, which is characterized by a congenital thymic
aplasia. Which type of immune deficiency would this child most likely have?
A. Humoral immunodeficiency (B-cell deficiency)
B. Cell-mediated immunodeficiency (T-cell deficiency)
C. Phagocytic cell dysfunction
D. Complement deficiency
Answer: B
Rationale: The thymus is the primary lymphoid organ where T-lymphocytes (T-cells) mature.
Congenital thymic aplasia (DiGeorge syndrome) results in a lack of functional T-cells, leading to
a severe cell-mediated immunodeficiency. While T-cells also play a role in helping B-cells
produce antibodies, the primary and most direct defect is in cell-mediated immunity.
7. A patient with systemic lupus erythematosus (SLE) develops a "butterfly" rash and
glomerulonephritis. The underlying mechanism for these manifestations is:
A. IgE-mediated hypersensitivity
B. Immune complex deposition (Type III hypersensitivity)
C. Cytotoxic T-cell mediated destruction (Type II hypersensitivity)
D. Delayed-type hypersensitivity (Type IV hypersensitivity)
Answer: B
Rationale: SLE is the classic example of a Type III hypersensitivity reaction. It involves the
formation of autoantibodies (e.g., anti-nuclear antibodies) that bind to self-antigens, forming
circulating immune complexes. These complexes deposit in various tissues, particularly the skin,
kidneys (glomeruli), and joints. The deposition triggers an inflammatory response, leading to the
characteristic rash and organ damage. Type I is IgE-mediated (allergies). Type II is antibody-
Practice Exam with questions and answers
with rationales (2026)
Instructions: Choose the best answer for each question. Rationales are
provided below each question.
1. A patient presents with a fever, a shift to the left in their white blood cell differential, and
elevated CRP. Which of the following best describes the primary purpose of the inflammatory
response?
A. To provide long-term, specific immunity against a pathogen
B. To neutralize, control, or eliminate the offending agent and prepare the site for healing
C. To induce a state of tolerance to prevent autoimmune reactions
D. To decrease vascular permeability and limit blood loss
Answer: B
Rationale: The inflammatory response is a non-specific, immediate reaction to tissue injury or
infection. Its primary goals are to neutralize and destroy the offending agent (e.g., pathogen,
toxin), remove debris, and initiate the healing process. A "shift to the left" indicates an increase
in immature neutrophils (bands), which are being rapidly released from the bone marrow to fight
infection. Option A describes adaptive immunity. Option C describes immune tolerance. Option
D is incorrect as inflammation increases vascular permeability to allow immune cells and
proteins into the tissue.
,2. A 65-year-old male with a history of chronic smoking presents with a persistent cough and
weight loss. A biopsy of a lung mass reveals cells with a high nuclear-to-cytoplasmic ratio,
hyperchromasia, and pleomorphism. These findings are most characteristic of:
A. Atrophy
B. Metaplasia
C. Dysplasia
D. Anaplasia
Answer: D
Rationale: Anaplasia is the hallmark of malignancy. It refers to a loss of cellular differentiation
and structural organization. Key features include pleomorphism (variation in cell size and shape),
hyperchromasia (darkly stained nuclei due to increased DNA), a high nuclear-to-cytoplasmic
ratio, and prominent nucleoli. Atrophy is a decrease in cell size. Metaplasia is the reversible
replacement of one mature cell type with another. Dysplasia refers to disordered growth and is a
precursor to malignancy, but anaplasia denotes the full malignant state.
3. Which of the following is the primary mechanism by which oncogenes contribute to the
development of cancer?
A. They are tumor suppressor genes that are inactivated.
B. They are normal genes that become overactive due to mutation.
C. They are involved in DNA repair mechanisms.
D. They are responsible for programmed cell death (apoptosis).
Answer: B
Rationale: Oncogenes are mutated versions of normal cellular genes called proto-oncogenes.
Proto-oncogenes normally promote controlled cell growth and division. When they acquire a
"gain-of-function" mutation, they become oncogenes, which drive excessive and uncontrolled
cell proliferation. Tumor suppressor genes (like p53 and Rb) are the ones that are inactivated
(Option A). Genes involved in DNA repair (Option C) and apoptosis (Option D) are also often
mutated in cancer, but the direct driving mechanism of oncogenes is overactivity.
,4. A patient with a severe bacterial infection develops septic shock. Which of the following
pathophysiological changes is most likely responsible for the hypotension observed in this
patient?
A. Massive vasoconstriction and increased systemic vascular resistance
B. Decreased production of nitric oxide (NO)
C. Widespread vasodilation and increased vascular permeability
D. Increased cardiac output due to sympathetic stimulation
Answer: C
Rationale: Septic shock is a form of distributive shock. The underlying pathophysiology involves
a massive systemic inflammatory response to infection. This leads to the release of inflammatory
mediators (like cytokines) that cause widespread vasodilation (decreasing systemic vascular
resistance) and increased capillary permeability (leading to fluid leakage into tissues). The result
is profound hypotension that is often unresponsive to fluid resuscitation alone. Option A is
characteristic of cardiogenic or hypovolemic shock. Option B is incorrect; NO is a potent
vasodilator and its production is often increased in sepsis.
5. Which of the following best describes the process of apoptosis?
A. Passive cell death due to severe injury, leading to inflammation
B. Programmed cell death that is energy-dependent and does not cause inflammation
C. Uncontrolled cell proliferation resulting in a tumor mass
D. Cell death due to hypoxia, resulting in cellular swelling and rupture
Answer: B
Rationale: Apoptosis is a form of programmed cell death that is a normal, regulated part of
growth and development, and it also serves to eliminate damaged or unwanted cells. It is an
active, energy (ATP)-dependent process. A key feature is that it does not incite an inflammatory
response because the cell membrane remains intact, and the cell breaks into apoptotic bodies that
, are quickly phagocytosed. Option A describes necrosis. Option C describes neoplasia. Option D
describes a common form of necrosis (e.g., ischemic cell death).
6. A child is diagnosed with DiGeorge syndrome, which is characterized by a congenital thymic
aplasia. Which type of immune deficiency would this child most likely have?
A. Humoral immunodeficiency (B-cell deficiency)
B. Cell-mediated immunodeficiency (T-cell deficiency)
C. Phagocytic cell dysfunction
D. Complement deficiency
Answer: B
Rationale: The thymus is the primary lymphoid organ where T-lymphocytes (T-cells) mature.
Congenital thymic aplasia (DiGeorge syndrome) results in a lack of functional T-cells, leading to
a severe cell-mediated immunodeficiency. While T-cells also play a role in helping B-cells
produce antibodies, the primary and most direct defect is in cell-mediated immunity.
7. A patient with systemic lupus erythematosus (SLE) develops a "butterfly" rash and
glomerulonephritis. The underlying mechanism for these manifestations is:
A. IgE-mediated hypersensitivity
B. Immune complex deposition (Type III hypersensitivity)
C. Cytotoxic T-cell mediated destruction (Type II hypersensitivity)
D. Delayed-type hypersensitivity (Type IV hypersensitivity)
Answer: B
Rationale: SLE is the classic example of a Type III hypersensitivity reaction. It involves the
formation of autoantibodies (e.g., anti-nuclear antibodies) that bind to self-antigens, forming
circulating immune complexes. These complexes deposit in various tissues, particularly the skin,
kidneys (glomeruli), and joints. The deposition triggers an inflammatory response, leading to the
characteristic rash and organ damage. Type I is IgE-mediated (allergies). Type II is antibody-
