RETA Refrigeration Project Management Exam Practice
Questions And Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download Pdf provide actual
exam
COMSAE Phase 1–Style Comprehensive
Practice Exam
Questions 1–20
Question 1 — Physiology
A 24-year-old man is brought to the emergency department after losing a large amount of blood
in a motor vehicle accident. His blood pressure is 85/55 mm Hg, and his heart rate is 125/min.
Which of the following changes is most likely occurring in response to his acute blood loss?
A. Increased parasympathetic activity
B. Decreased renin secretion
C. Increased systemic vascular resistance
D. Decreased circulating catecholamines
E. Increased renal sodium excretion
Correct Answer: C. Increased systemic vascular resistance
Rationale:
Acute blood loss causes a reduction in circulating blood volume and venous return, resulting in
decreased cardiac output and arterial pressure. The baroreceptor reflex responds by increasing
sympathetic nervous system activity. This produces tachycardia, increased myocardial
contractility, and peripheral vasoconstriction, which increases systemic vascular resistance.
Renin release also increases, promoting activation of the renin-angiotensin-aldosterone system.
• A is incorrect: Parasympathetic activity decreases while sympathetic activity increases.
• B is incorrect: Renin secretion increases because renal perfusion pressure falls.
• D is incorrect: Catecholamine release increases.
• E is incorrect: Sodium retention increases due to RAAS activation and sympathetic
stimulation.
Key Learning Point: Acute hemorrhage activates the sympathetic nervous system and RAAS,
producing tachycardia, vasoconstriction, and sodium/water retention.
,Question 2 — Microbiology
A 67-year-old man with chronic obstructive pulmonary disease develops fever, productive
cough, and shortness of breath. Sputum Gram stain shows gram-positive, lancet-shaped
diplococci. Which organism is the most likely cause?
A. Staphylococcus aureus
B. Streptococcus pneumoniae
C. Streptococcus pyogenes
D. Klebsiella pneumoniae
E. Haemophilus influenzae
Correct Answer: B. Streptococcus pneumoniae
Rationale:
Streptococcus pneumoniae is a gram-positive, lancet-shaped, alpha-hemolytic diplococcus and is
a major cause of community-acquired pneumonia. It is encapsulated and optochin sensitive.
• A is incorrect: S. aureus appears as gram-positive cocci in clusters.
• C is incorrect: S. pyogenes is a beta-hemolytic, gram-positive coccus in chains.
• D is incorrect: K. pneumoniae is a gram-negative rod and may cause pneumonia with
thick, blood-tinged sputum.
• E is incorrect: H. influenzae is a gram-negative coccobacillus.
Key Learning Point: Lancet-shaped gram-positive diplococci = S. pneumoniae.
Question 3 — Pharmacology
A patient with hypertension is prescribed lisinopril. Several weeks later, he develops a persistent
dry cough. Which mechanism best explains this adverse effect?
A. Increased bradykinin degradation
B. Increased histamine release
C. Decreased bradykinin degradation
D. Increased aldosterone secretion
E. Direct bronchial smooth muscle contraction
Correct Answer: C. Decreased bradykinin degradation
Rationale:
ACE inhibitors block conversion of angiotensin I to angiotensin II and also decrease the
breakdown of bradykinin. Accumulation of bradykinin can cause a persistent dry cough and, in
some patients, angioedema.
, • A is incorrect: ACE normally degrades bradykinin; inhibition decreases its degradation.
• B is incorrect: Histamine is not the primary mediator of the ACE inhibitor cough.
• D is incorrect: Aldosterone secretion decreases due to reduced angiotensin II.
• E is incorrect: Direct bronchial smooth muscle contraction does not explain the
characteristic ACE inhibitor cough.
Key Learning Point: ACE inhibitor cough is associated with increased bradykinin levels.
Question 4 — Pathology
A 58-year-old man with a long history of smoking presents with hemoptysis and weight loss.
Imaging reveals a central lung mass. Biopsy shows malignant cells with keratin pearls and
intercellular bridges. Which diagnosis is most likely?
A. Adenocarcinoma
B. Small cell carcinoma
C. Squamous cell carcinoma
D. Large cell carcinoma
E. Carcinoid tumor
Correct Answer: C. Squamous cell carcinoma
Rationale:
Squamous cell carcinoma of the lung is strongly associated with smoking and commonly arises
centrally near the bronchi. Histology demonstrates keratin pearls and intercellular bridges. It may
also produce parathyroid hormone-related peptide, causing hypercalcemia.
• A is incorrect: Adenocarcinoma is generally peripheral and forms glandular structures.
• B is incorrect: Small cell carcinoma consists of small cells with scant cytoplasm and
nuclear molding and is associated with neuroendocrine markers.
• D is incorrect: Large cell carcinoma lacks the defining features of squamous or
glandular differentiation.
• E is incorrect: Carcinoid tumors are neuroendocrine tumors and are not characterized by
keratin pearls.
Key Learning Point: Central lung mass + smoker + keratin pearls = squamous cell
carcinoma.
Question 5 — Biochemistry
, A child develops severe muscle cramps and hemolysis after taking a medication that causes
oxidative stress. Laboratory testing shows decreased activity of glucose-6-phosphate
dehydrogenase. Which pathway is primarily impaired?
A. Glycolysis
B. Citric acid cycle
C. Pentose phosphate pathway
D. Urea cycle
E. Beta-oxidation
Correct Answer: C. Pentose phosphate pathway
Rationale:
Glucose-6-phosphate dehydrogenase catalyzes the rate-limiting step of the pentose phosphate
pathway. This pathway produces NADPH, which maintains glutathione in its reduced form.
Reduced glutathione protects red blood cells from oxidative damage. G6PD deficiency can
therefore cause episodic hemolytic anemia following oxidative stress.
• A is incorrect: Glycolysis produces ATP and pyruvate but does not primarily generate
NADPH.
• B is incorrect: The citric acid cycle occurs in mitochondria and generates reducing
equivalents for oxidative phosphorylation.
• D is incorrect: The urea cycle removes excess nitrogen.
• E is incorrect: Beta-oxidation breaks down fatty acids.
Key Learning Point: G6PD deficiency impairs NADPH production, reducing protection
against oxidative stress.
Question 6 — Anatomy
A patient sustains a fracture of the surgical neck of the humerus. Which nerve is most likely
injured?
A. Radial nerve
B. Median nerve
C. Ulnar nerve
D. Axillary nerve
E. Musculocutaneous nerve
Correct Answer: D. Axillary nerve
Rationale:
The axillary nerve travels around the surgical neck of the humerus with the posterior circumflex
Questions And Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download Pdf provide actual
exam
COMSAE Phase 1–Style Comprehensive
Practice Exam
Questions 1–20
Question 1 — Physiology
A 24-year-old man is brought to the emergency department after losing a large amount of blood
in a motor vehicle accident. His blood pressure is 85/55 mm Hg, and his heart rate is 125/min.
Which of the following changes is most likely occurring in response to his acute blood loss?
A. Increased parasympathetic activity
B. Decreased renin secretion
C. Increased systemic vascular resistance
D. Decreased circulating catecholamines
E. Increased renal sodium excretion
Correct Answer: C. Increased systemic vascular resistance
Rationale:
Acute blood loss causes a reduction in circulating blood volume and venous return, resulting in
decreased cardiac output and arterial pressure. The baroreceptor reflex responds by increasing
sympathetic nervous system activity. This produces tachycardia, increased myocardial
contractility, and peripheral vasoconstriction, which increases systemic vascular resistance.
Renin release also increases, promoting activation of the renin-angiotensin-aldosterone system.
• A is incorrect: Parasympathetic activity decreases while sympathetic activity increases.
• B is incorrect: Renin secretion increases because renal perfusion pressure falls.
• D is incorrect: Catecholamine release increases.
• E is incorrect: Sodium retention increases due to RAAS activation and sympathetic
stimulation.
Key Learning Point: Acute hemorrhage activates the sympathetic nervous system and RAAS,
producing tachycardia, vasoconstriction, and sodium/water retention.
,Question 2 — Microbiology
A 67-year-old man with chronic obstructive pulmonary disease develops fever, productive
cough, and shortness of breath. Sputum Gram stain shows gram-positive, lancet-shaped
diplococci. Which organism is the most likely cause?
A. Staphylococcus aureus
B. Streptococcus pneumoniae
C. Streptococcus pyogenes
D. Klebsiella pneumoniae
E. Haemophilus influenzae
Correct Answer: B. Streptococcus pneumoniae
Rationale:
Streptococcus pneumoniae is a gram-positive, lancet-shaped, alpha-hemolytic diplococcus and is
a major cause of community-acquired pneumonia. It is encapsulated and optochin sensitive.
• A is incorrect: S. aureus appears as gram-positive cocci in clusters.
• C is incorrect: S. pyogenes is a beta-hemolytic, gram-positive coccus in chains.
• D is incorrect: K. pneumoniae is a gram-negative rod and may cause pneumonia with
thick, blood-tinged sputum.
• E is incorrect: H. influenzae is a gram-negative coccobacillus.
Key Learning Point: Lancet-shaped gram-positive diplococci = S. pneumoniae.
Question 3 — Pharmacology
A patient with hypertension is prescribed lisinopril. Several weeks later, he develops a persistent
dry cough. Which mechanism best explains this adverse effect?
A. Increased bradykinin degradation
B. Increased histamine release
C. Decreased bradykinin degradation
D. Increased aldosterone secretion
E. Direct bronchial smooth muscle contraction
Correct Answer: C. Decreased bradykinin degradation
Rationale:
ACE inhibitors block conversion of angiotensin I to angiotensin II and also decrease the
breakdown of bradykinin. Accumulation of bradykinin can cause a persistent dry cough and, in
some patients, angioedema.
, • A is incorrect: ACE normally degrades bradykinin; inhibition decreases its degradation.
• B is incorrect: Histamine is not the primary mediator of the ACE inhibitor cough.
• D is incorrect: Aldosterone secretion decreases due to reduced angiotensin II.
• E is incorrect: Direct bronchial smooth muscle contraction does not explain the
characteristic ACE inhibitor cough.
Key Learning Point: ACE inhibitor cough is associated with increased bradykinin levels.
Question 4 — Pathology
A 58-year-old man with a long history of smoking presents with hemoptysis and weight loss.
Imaging reveals a central lung mass. Biopsy shows malignant cells with keratin pearls and
intercellular bridges. Which diagnosis is most likely?
A. Adenocarcinoma
B. Small cell carcinoma
C. Squamous cell carcinoma
D. Large cell carcinoma
E. Carcinoid tumor
Correct Answer: C. Squamous cell carcinoma
Rationale:
Squamous cell carcinoma of the lung is strongly associated with smoking and commonly arises
centrally near the bronchi. Histology demonstrates keratin pearls and intercellular bridges. It may
also produce parathyroid hormone-related peptide, causing hypercalcemia.
• A is incorrect: Adenocarcinoma is generally peripheral and forms glandular structures.
• B is incorrect: Small cell carcinoma consists of small cells with scant cytoplasm and
nuclear molding and is associated with neuroendocrine markers.
• D is incorrect: Large cell carcinoma lacks the defining features of squamous or
glandular differentiation.
• E is incorrect: Carcinoid tumors are neuroendocrine tumors and are not characterized by
keratin pearls.
Key Learning Point: Central lung mass + smoker + keratin pearls = squamous cell
carcinoma.
Question 5 — Biochemistry
, A child develops severe muscle cramps and hemolysis after taking a medication that causes
oxidative stress. Laboratory testing shows decreased activity of glucose-6-phosphate
dehydrogenase. Which pathway is primarily impaired?
A. Glycolysis
B. Citric acid cycle
C. Pentose phosphate pathway
D. Urea cycle
E. Beta-oxidation
Correct Answer: C. Pentose phosphate pathway
Rationale:
Glucose-6-phosphate dehydrogenase catalyzes the rate-limiting step of the pentose phosphate
pathway. This pathway produces NADPH, which maintains glutathione in its reduced form.
Reduced glutathione protects red blood cells from oxidative damage. G6PD deficiency can
therefore cause episodic hemolytic anemia following oxidative stress.
• A is incorrect: Glycolysis produces ATP and pyruvate but does not primarily generate
NADPH.
• B is incorrect: The citric acid cycle occurs in mitochondria and generates reducing
equivalents for oxidative phosphorylation.
• D is incorrect: The urea cycle removes excess nitrogen.
• E is incorrect: Beta-oxidation breaks down fatty acids.
Key Learning Point: G6PD deficiency impairs NADPH production, reducing protection
against oxidative stress.
Question 6 — Anatomy
A patient sustains a fracture of the surgical neck of the humerus. Which nerve is most likely
injured?
A. Radial nerve
B. Median nerve
C. Ulnar nerve
D. Axillary nerve
E. Musculocutaneous nerve
Correct Answer: D. Axillary nerve
Rationale:
The axillary nerve travels around the surgical neck of the humerus with the posterior circumflex
