BIO 669 Exam 2 Practice Questions and
Answers | Advanced Pathophysiology
Master Test Bank Guide (Updated
Solutions)
Question 1
A 45-year-old patient presents with severe right upper quadrant pain that radiates to
the right shoulder, accompanied by nausea and a low-grade fever. Physical
examination reveals a positive Murphy's sign. Which of the following is the most
likely diagnosis?
A. Acute pancreatitis
B. Acute cholecystitis
,C. Acute appendicitis
D. Peptic ulcer disease
VERIFIED ANSWER: B
EXPLANATION: Acute cholecystitis is an inflammation of the gallbladder, most
commonly caused by cystic duct obstruction from gallstones. It classically
presents with right upper quadrant (RUQ) pain that can radiate to the right
scapula or shoulder (due to phrenic nerve irritation). A positive Murphy's sign
(arrest of inspiration upon deep palpation of the RUQ) is highly specific for
gallbladder inflammation. While pancreatitis presents with epigastric pain
radiating to the back and appendicitis presents with right lower quadrant pain,
neither exhibits a positive Murphy's sign.
Question 2
During a cellular biology experiment, a researcher notes that a specific protein fails
to undergo proper folding and accumulates inside the cell. Which organelle is
primarily responsible for the synthesis, folding, and structural modification of
transmembrane proteins?
A. Golgi apparatus
B. Rough endoplasmic reticulum
C. Lysosome
D. Smooth endoplasmic reticulum
VERIFIED ANSWER: B
EXPLANATION: The rough endoplasmic reticulum (RER) is studded with
ribosomes and is the primary site for the synthesis, folding, and post-
translational modification of membrane-bound, lysosomal, and secretory
proteins. The Golgi apparatus processes and packages these proteins
afterward, but does not perform initial folding. The smooth endoplasmic
reticulum is involved in lipid and steroid synthesis, while lysosomes are
responsible for degradation.
Question 3
An 8-year-old child is brought to the clinic due to sudden behavioral changes, motor
tics, and obsessive-compulsive tendencies following a severe sore throat infection
three weeks ago. Laboratory work confirms a recent Streptococcus pyogenes
infection. Which of the following conditions best explains this presentation?
A. Sydenham chorea
B. Tourette syndrome
,C. PANDAS
D. Huntington's disease
VERIFIED ANSWER: C
EXPLANATION: PANDAS stands for Pediatric Autoimmune Neuropsychiatric
Disorders Associated with Streptococcal Infections. It is characterized by the
sudden onset or exacerbation of obsessive-compulsive disorder (OCD) or tic
disorders following a Group A streptococcal infection. Sydenham chorea also
follows streptococcal infections but is characterized by involuntary,
purposeless, jerky movements rather than isolated behavioral tics.
Question 4
A patient presents to the emergency room with extreme muscle weakness and an
abnormal electrocardiogram (ECG) demonstrating peaked T waves, a prolonged PR
interval, and a widened QRS complex. Which of the following electrolyte imbalances
is most likely present?
A. Hypokalemia
B. Hypernatremia
C. Hyperkalemia
D. Hypocalcemia
VERIFIED ANSWER: C
EXPLANATION: Hyperkalemia (elevated serum potassium levels) drastically
alters cardiac conduction. The classic progression of ECG changes includes
peaked T waves, followed by PR interval prolongation, QRS widening, and
eventually a "sine wave" pattern leading to ventricular fibrillation.
Hypokalemia, by contrast, causes T-wave flattening and U waves.
Question 5
In economics, if a 10% increase in the price of a good leads to a 25% decrease in
the quantity demanded, the price elasticity of demand for this good is classified as:
A. Perfectly inelastic
B. Inelastic
C. Unit elastic
D. Elastic
VERIFIED ANSWER: D
EXPLANATION: Price elasticity of demand is calculated as the percentage
change in quantity demanded divided by the percentage change in price (-25%
/ 10% = -2.5). Since the absolute value (2.5) is greater than 1, the demand is
, considered elastic, meaning consumers are highly responsive to price
changes.
Question 6
A pharmacological agent works by irreversibly binding to and inhibiting the H+/K+-
ATPase pump in gastric parietal cells. This mechanism of action belongs to which
class of medications?
A. H2-receptor antagonists
B. Proton pump inhibitors
C. Antacids
D. Prokinetic agents
VERIFIED ANSWER: B
EXPLANATION: Proton pump inhibitors (PPIs), such as omeprazole, work by
directly and irreversibly inhibiting the H+/K+-ATPase enzyme system (the
proton pump) of the gastric parietal cell. This blocks the final step of gastric
acid secretion. H2-receptor antagonists block histamine receptors instead of
the pump directly.
Question 7
A 62-year-old male presents with persistent cough, hemoptysis, and unexplained
weight loss. A chest X-ray reveals a central hilar mass. The patient has a 40 pack-
year smoking history. Biopsy reveals sheets of small, round blue cells with minimal
cytoplasm. What is the most likely diagnosis?
A. Adenocarcinoma of the lung
B. Large cell carcinoma
C. Small cell lung carcinoma
D. Squamous cell carcinoma
VERIFIED ANSWER: C
EXPLANATION: Small cell lung carcinoma (SCLC) is strongly associated with
smoking, characteristically presents as a central mass, and histologically
exhibits small, round blue cells ("oat cells") due to its neuroendocrine origin.
Adenocarcinoma is typically peripheral and more common in non-smokers,
while squamous cell carcinoma forms keratin pearls.
Answers | Advanced Pathophysiology
Master Test Bank Guide (Updated
Solutions)
Question 1
A 45-year-old patient presents with severe right upper quadrant pain that radiates to
the right shoulder, accompanied by nausea and a low-grade fever. Physical
examination reveals a positive Murphy's sign. Which of the following is the most
likely diagnosis?
A. Acute pancreatitis
B. Acute cholecystitis
,C. Acute appendicitis
D. Peptic ulcer disease
VERIFIED ANSWER: B
EXPLANATION: Acute cholecystitis is an inflammation of the gallbladder, most
commonly caused by cystic duct obstruction from gallstones. It classically
presents with right upper quadrant (RUQ) pain that can radiate to the right
scapula or shoulder (due to phrenic nerve irritation). A positive Murphy's sign
(arrest of inspiration upon deep palpation of the RUQ) is highly specific for
gallbladder inflammation. While pancreatitis presents with epigastric pain
radiating to the back and appendicitis presents with right lower quadrant pain,
neither exhibits a positive Murphy's sign.
Question 2
During a cellular biology experiment, a researcher notes that a specific protein fails
to undergo proper folding and accumulates inside the cell. Which organelle is
primarily responsible for the synthesis, folding, and structural modification of
transmembrane proteins?
A. Golgi apparatus
B. Rough endoplasmic reticulum
C. Lysosome
D. Smooth endoplasmic reticulum
VERIFIED ANSWER: B
EXPLANATION: The rough endoplasmic reticulum (RER) is studded with
ribosomes and is the primary site for the synthesis, folding, and post-
translational modification of membrane-bound, lysosomal, and secretory
proteins. The Golgi apparatus processes and packages these proteins
afterward, but does not perform initial folding. The smooth endoplasmic
reticulum is involved in lipid and steroid synthesis, while lysosomes are
responsible for degradation.
Question 3
An 8-year-old child is brought to the clinic due to sudden behavioral changes, motor
tics, and obsessive-compulsive tendencies following a severe sore throat infection
three weeks ago. Laboratory work confirms a recent Streptococcus pyogenes
infection. Which of the following conditions best explains this presentation?
A. Sydenham chorea
B. Tourette syndrome
,C. PANDAS
D. Huntington's disease
VERIFIED ANSWER: C
EXPLANATION: PANDAS stands for Pediatric Autoimmune Neuropsychiatric
Disorders Associated with Streptococcal Infections. It is characterized by the
sudden onset or exacerbation of obsessive-compulsive disorder (OCD) or tic
disorders following a Group A streptococcal infection. Sydenham chorea also
follows streptococcal infections but is characterized by involuntary,
purposeless, jerky movements rather than isolated behavioral tics.
Question 4
A patient presents to the emergency room with extreme muscle weakness and an
abnormal electrocardiogram (ECG) demonstrating peaked T waves, a prolonged PR
interval, and a widened QRS complex. Which of the following electrolyte imbalances
is most likely present?
A. Hypokalemia
B. Hypernatremia
C. Hyperkalemia
D. Hypocalcemia
VERIFIED ANSWER: C
EXPLANATION: Hyperkalemia (elevated serum potassium levels) drastically
alters cardiac conduction. The classic progression of ECG changes includes
peaked T waves, followed by PR interval prolongation, QRS widening, and
eventually a "sine wave" pattern leading to ventricular fibrillation.
Hypokalemia, by contrast, causes T-wave flattening and U waves.
Question 5
In economics, if a 10% increase in the price of a good leads to a 25% decrease in
the quantity demanded, the price elasticity of demand for this good is classified as:
A. Perfectly inelastic
B. Inelastic
C. Unit elastic
D. Elastic
VERIFIED ANSWER: D
EXPLANATION: Price elasticity of demand is calculated as the percentage
change in quantity demanded divided by the percentage change in price (-25%
/ 10% = -2.5). Since the absolute value (2.5) is greater than 1, the demand is
, considered elastic, meaning consumers are highly responsive to price
changes.
Question 6
A pharmacological agent works by irreversibly binding to and inhibiting the H+/K+-
ATPase pump in gastric parietal cells. This mechanism of action belongs to which
class of medications?
A. H2-receptor antagonists
B. Proton pump inhibitors
C. Antacids
D. Prokinetic agents
VERIFIED ANSWER: B
EXPLANATION: Proton pump inhibitors (PPIs), such as omeprazole, work by
directly and irreversibly inhibiting the H+/K+-ATPase enzyme system (the
proton pump) of the gastric parietal cell. This blocks the final step of gastric
acid secretion. H2-receptor antagonists block histamine receptors instead of
the pump directly.
Question 7
A 62-year-old male presents with persistent cough, hemoptysis, and unexplained
weight loss. A chest X-ray reveals a central hilar mass. The patient has a 40 pack-
year smoking history. Biopsy reveals sheets of small, round blue cells with minimal
cytoplasm. What is the most likely diagnosis?
A. Adenocarcinoma of the lung
B. Large cell carcinoma
C. Small cell lung carcinoma
D. Squamous cell carcinoma
VERIFIED ANSWER: C
EXPLANATION: Small cell lung carcinoma (SCLC) is strongly associated with
smoking, characteristically presents as a central mass, and histologically
exhibits small, round blue cells ("oat cells") due to its neuroendocrine origin.
Adenocarcinoma is typically peripheral and more common in non-smokers,
while squamous cell carcinoma forms keratin pearls.
