WGU C805 Pathophysiology Objective
Assessment | Complete Q-Bank with
Detailed Explanations & Test-Taking
Strategies
Questions 1-25: Cellular Adaptation, Injury, & Neoplasia
Question 1
A 68-year-old male with a 50-pack-year smoking history presents with a chronic
cough and hemoptysis. A CT scan reveals a 3 cm solitary pulmonary nodule. A biopsy
shows cells that are poorly differentiated, with large, hyperchromatic nuclei and a
high nuclear-to-cytoplasmic ratio, invading the bronchial wall. Which cellular
characteristic best describes this lesion?
A. Well-differentiated benign adenoma
B. Metaplastic squamous epithelium
C. Dysplastic cells confined to the basement membrane
D. Anaplastic malignant carcinoma
Rationale: Anaplasia refers to a lack of cellular differentiation, pleomorphism
(variation in size/shape), hyperchromatic nuclei, and invasive growth—
hallmarks of malignancy. Benign tumors are well-differentiated; dysplasia is
pre-malignant and non-invasive; metaplasia is a reversible change from one
mature cell type to another (e.g., columnar to squamous).
Question 2
A 55-year-old female with chronic gastroesophageal reflux disease (GERD)
undergoes an upper endoscopy. The pathologist reports that the squamous
epithelium of the distal esophagus has been replaced by columnar epithelium
resembling that of the stomach. This cellular adaptation is best described as:
A. Hyperplasia
B. Hypertrophy
C. Atrophy
D. Metaplasia
,Rationale: Metaplasia is the reversible replacement of one differentiated cell
type with another, often in response to chronic irritation (e.g., GERD causing
Barrett's esophagus). Hyperplasia is an increase in cell number; hypertrophy is
an increase in cell size; atrophy is a decrease in cell size.
Question 3
Table 1: Types of Cellular Adaptations
Adaptation Definition Clinical Example
A. Hyperplasia Increase in the NUMBER of cells Benign prostatic hyperplasia
B. Left ventricular hypertrophy from
Increase in the SIZE of cells
Hypertrophy hypertension
C. Atrophy Decrease in the SIZE of cells Disuse atrophy of a limb in a cast
Replacement of one cell type with
D. Metaplasia Barrett's esophagus
another
A 70-year-old male with uncontrolled hypertension presents with exertional dyspnea.
An echocardiogram reveals thickening of the left ventricular wall. Based on the table
above, which cellular adaptation is most likely responsible for this finding?
A. Hyperplasia
B. Metaplasia
C. Atrophy
D. Hypertrophy
Rationale: The increased workload on the heart (afterload) from hypertension
causes individual cardiac myocytes to enlarge, leading to an increase in the size
of the organ (hypertrophy). Hyperplasia (increased cell number) rarely occurs in
cardiac muscle as it is terminally differentiated.
Question 4
A patient is diagnosed with a benign tumor. Which of the following characteristics is
most consistent with this diagnosis?
A. Rapid growth rate and metastasis to regional lymph nodes
,B. Invasion of surrounding tissues and angiogenesis
C. Well-circumscribed, slow-growing mass without distant spread
D. Anaplastic cells with high mitotic activity
Rationale: Benign tumors are generally slow-growing, well-circumscribed
(encapsulated), and remain localized. They do not invade local tissues or
metastasize distantly. Anaplasia, rapid growth, and high mitotic rates are
features of malignancy.
Question 5
A researcher is studying a chemical carcinogen that causes DNA adduct formation,
leading to a mutation in the p53 tumor suppressor gene. What is the primary
function of the normal p53 gene product?
A. To promote cell cycle progression from G1 to S phase
B. To inhibit apoptosis and promote cell survival
C. To induce cell cycle arrest or apoptosis in response to DNA damage
D. To activate proto-oncogenes to stimulate growth
Rationale: The p53 protein is known as the "guardian of the genome." Its
primary role is to detect DNA damage and halt the cell cycle (at G1/S
checkpoint) to allow for repair, or to initiate apoptosis if damage is irreparable.
Mutations in p53 are the most common genetic changes seen in human cancers.
Question 6
A 45-year-old woman presents with a 2 cm, firm, non-tender lump in her right breast.
A mammogram shows a well-circumscribed, smooth-edged mass. A fine-needle
aspiration reveals cells that are uniform in size and shape, with a low mitotic index.
Which term best describes this neoplasm?
A. Carcinoma in situ
B. Malignant adenocarcinoma
C. Benign fibroadenoma
D. Anaplastic sarcoma
Rationale: The description of a well-circumscribed, non-tender mass with
uniform cells and low mitotic activity is characteristic of a benign tumor
(fibroadenoma). Malignant tumors are poorly circumscribed and invasive.
Carcinoma in situ is non-invasive but has malignant cells within the basement
membrane.
, Question 7
A patient is told their tumor has "metastasized." This means the tumor has:
A. Started to secrete hormones
B. Become encapsulated and localized
C. Spread to a distant site via the blood or lymphatic system
D. Undergone necrosis due to lack of oxygen
Rationale: Metastasis is the hallmark of malignancy and is defined as the
spread of tumor cells from the primary site to distant organs and tissues via the
bloodstream or lymphatic system. It is a multi-step process involving invasion,
angiogenesis, and extravasation.
Question 8
A 60-year-old male with a history of alcoholism and hepatitis C presents with ascites,
jaundice, and confusion. Liver biopsy reveals hepatocytes that have increased in size
and number, with large, irregular, hyperchromatic nuclei and a loss of normal lobular
architecture. Which cellular change is the most direct precursor to hepatocellular
carcinoma?
A. Fatty infiltration (steatosis)
B. Hepatocellular hypertrophy
C. Focal nodular hyperplasia
D. Dysplasia
Rationale: Dysplasia is characterized by abnormal cellular growth, loss of
architectural orientation, pleomorphism, and hyperchromatic nuclei. It is
considered a pre-neoplastic (pre-malignant) lesion. While cirrhosis is a risk
factor, it is the dysplastic changes within the cirrhotic liver that are the direct
precursors to malignancy.
Question 9
Figure 1: Basic Tumor Progression
text
Normal Cell --(Mutation)--> [Initiated Cell] --(Promotion)--> [Pre-malignant Lesio
n (Dysplasia)] --(Progression)--> [Malignant Tumor (Invasive)] --(Metastasis)--> [
Distant Spread]
A patient is exposed to a chemical that acts as a tumor "initiator." According to the
diagram above, what is the primary effect of this initiator?
A. Promoting the growth of an already existing tumor
Assessment | Complete Q-Bank with
Detailed Explanations & Test-Taking
Strategies
Questions 1-25: Cellular Adaptation, Injury, & Neoplasia
Question 1
A 68-year-old male with a 50-pack-year smoking history presents with a chronic
cough and hemoptysis. A CT scan reveals a 3 cm solitary pulmonary nodule. A biopsy
shows cells that are poorly differentiated, with large, hyperchromatic nuclei and a
high nuclear-to-cytoplasmic ratio, invading the bronchial wall. Which cellular
characteristic best describes this lesion?
A. Well-differentiated benign adenoma
B. Metaplastic squamous epithelium
C. Dysplastic cells confined to the basement membrane
D. Anaplastic malignant carcinoma
Rationale: Anaplasia refers to a lack of cellular differentiation, pleomorphism
(variation in size/shape), hyperchromatic nuclei, and invasive growth—
hallmarks of malignancy. Benign tumors are well-differentiated; dysplasia is
pre-malignant and non-invasive; metaplasia is a reversible change from one
mature cell type to another (e.g., columnar to squamous).
Question 2
A 55-year-old female with chronic gastroesophageal reflux disease (GERD)
undergoes an upper endoscopy. The pathologist reports that the squamous
epithelium of the distal esophagus has been replaced by columnar epithelium
resembling that of the stomach. This cellular adaptation is best described as:
A. Hyperplasia
B. Hypertrophy
C. Atrophy
D. Metaplasia
,Rationale: Metaplasia is the reversible replacement of one differentiated cell
type with another, often in response to chronic irritation (e.g., GERD causing
Barrett's esophagus). Hyperplasia is an increase in cell number; hypertrophy is
an increase in cell size; atrophy is a decrease in cell size.
Question 3
Table 1: Types of Cellular Adaptations
Adaptation Definition Clinical Example
A. Hyperplasia Increase in the NUMBER of cells Benign prostatic hyperplasia
B. Left ventricular hypertrophy from
Increase in the SIZE of cells
Hypertrophy hypertension
C. Atrophy Decrease in the SIZE of cells Disuse atrophy of a limb in a cast
Replacement of one cell type with
D. Metaplasia Barrett's esophagus
another
A 70-year-old male with uncontrolled hypertension presents with exertional dyspnea.
An echocardiogram reveals thickening of the left ventricular wall. Based on the table
above, which cellular adaptation is most likely responsible for this finding?
A. Hyperplasia
B. Metaplasia
C. Atrophy
D. Hypertrophy
Rationale: The increased workload on the heart (afterload) from hypertension
causes individual cardiac myocytes to enlarge, leading to an increase in the size
of the organ (hypertrophy). Hyperplasia (increased cell number) rarely occurs in
cardiac muscle as it is terminally differentiated.
Question 4
A patient is diagnosed with a benign tumor. Which of the following characteristics is
most consistent with this diagnosis?
A. Rapid growth rate and metastasis to regional lymph nodes
,B. Invasion of surrounding tissues and angiogenesis
C. Well-circumscribed, slow-growing mass without distant spread
D. Anaplastic cells with high mitotic activity
Rationale: Benign tumors are generally slow-growing, well-circumscribed
(encapsulated), and remain localized. They do not invade local tissues or
metastasize distantly. Anaplasia, rapid growth, and high mitotic rates are
features of malignancy.
Question 5
A researcher is studying a chemical carcinogen that causes DNA adduct formation,
leading to a mutation in the p53 tumor suppressor gene. What is the primary
function of the normal p53 gene product?
A. To promote cell cycle progression from G1 to S phase
B. To inhibit apoptosis and promote cell survival
C. To induce cell cycle arrest or apoptosis in response to DNA damage
D. To activate proto-oncogenes to stimulate growth
Rationale: The p53 protein is known as the "guardian of the genome." Its
primary role is to detect DNA damage and halt the cell cycle (at G1/S
checkpoint) to allow for repair, or to initiate apoptosis if damage is irreparable.
Mutations in p53 are the most common genetic changes seen in human cancers.
Question 6
A 45-year-old woman presents with a 2 cm, firm, non-tender lump in her right breast.
A mammogram shows a well-circumscribed, smooth-edged mass. A fine-needle
aspiration reveals cells that are uniform in size and shape, with a low mitotic index.
Which term best describes this neoplasm?
A. Carcinoma in situ
B. Malignant adenocarcinoma
C. Benign fibroadenoma
D. Anaplastic sarcoma
Rationale: The description of a well-circumscribed, non-tender mass with
uniform cells and low mitotic activity is characteristic of a benign tumor
(fibroadenoma). Malignant tumors are poorly circumscribed and invasive.
Carcinoma in situ is non-invasive but has malignant cells within the basement
membrane.
, Question 7
A patient is told their tumor has "metastasized." This means the tumor has:
A. Started to secrete hormones
B. Become encapsulated and localized
C. Spread to a distant site via the blood or lymphatic system
D. Undergone necrosis due to lack of oxygen
Rationale: Metastasis is the hallmark of malignancy and is defined as the
spread of tumor cells from the primary site to distant organs and tissues via the
bloodstream or lymphatic system. It is a multi-step process involving invasion,
angiogenesis, and extravasation.
Question 8
A 60-year-old male with a history of alcoholism and hepatitis C presents with ascites,
jaundice, and confusion. Liver biopsy reveals hepatocytes that have increased in size
and number, with large, irregular, hyperchromatic nuclei and a loss of normal lobular
architecture. Which cellular change is the most direct precursor to hepatocellular
carcinoma?
A. Fatty infiltration (steatosis)
B. Hepatocellular hypertrophy
C. Focal nodular hyperplasia
D. Dysplasia
Rationale: Dysplasia is characterized by abnormal cellular growth, loss of
architectural orientation, pleomorphism, and hyperchromatic nuclei. It is
considered a pre-neoplastic (pre-malignant) lesion. While cirrhosis is a risk
factor, it is the dysplastic changes within the cirrhotic liver that are the direct
precursors to malignancy.
Question 9
Figure 1: Basic Tumor Progression
text
Normal Cell --(Mutation)--> [Initiated Cell] --(Promotion)--> [Pre-malignant Lesio
n (Dysplasia)] --(Progression)--> [Malignant Tumor (Invasive)] --(Metastasis)--> [
Distant Spread]
A patient is exposed to a chemical that acts as a tumor "initiator." According to the
diagram above, what is the primary effect of this initiator?
A. Promoting the growth of an already existing tumor
