COMSAE PHASE 1 FORM 113 EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL
DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS*
• Anatomy and Embryology
• Physiology and Pathophysiology
• Biochemistry and Molecular Biology
• Microbiology and Immunology
• Pharmacology
• Pathology
• Behavioral Science and Ethics
• Osteopathic Principles and Practice
• Clinical Reasoning and Patient Management
• Epidemiology and Preventive Medicine
INTRODUCTION*
This assessment is designed to evaluate comprehensive foundational medical knowledge and
clinical reasoning skills required for success on the COMSAE Phase 1 examination. The exam
emphasizes integration of biomedical sciences with patient-centered clinical applications
through multiple-choice and scenario-based questions. Candidates are tested on diagnostic
,interpretation, disease mechanisms, pharmacologic management, ethics, preventive
medicine, and osteopathic principles. Questions are structured to assess analytical thinking,
decision-making, and the ability to apply core scientific concepts to realistic healthcare
situations. This format mirrors professional board-style examinations and promotes
readiness for complex clinical problem-solving encountered in medical training and patient
care.
SECTION ONE: QUESTIONS 1–50
1. A 24-year-old man presents with episodic wheezing and shortness of breath after
exposure to pollen. Which immunoglobulin is primarily responsible for the immediate
hypersensitivity reaction?
A. IgA
B. IgE
C. IgM
D. IgG
🟢 Correct Answer: B. IgE
🔴 Explanation: IgE mediates type I hypersensitivity reactions by binding mast cells and
basophils, leading to histamine release after allergen exposure.
2. A patient with uncontrolled diabetes mellitus develops ketoacidosis. Which enzyme is
primarily responsible for ketone body formation?
,A. HMG-CoA synthase
B. Pyruvate kinase
C. Glycogen phosphorylase
D. Acetyl-CoA carboxylase
🟢 Correct Answer: A. HMG-CoA synthase
🔴 Explanation: HMG-CoA synthase is the rate-limiting enzyme in ketogenesis occurring
within hepatic mitochondria.
3. A 67-year-old smoker presents with hematuria. Biopsy confirms transitional cell
carcinoma of the bladder. Which risk factor is most strongly associated with this
cancer?
A. Asbestos exposure
B. Alcohol consumption
C. Cigarette smoking
D. Ultraviolet radiation
🟢 Correct Answer: C. Cigarette smoking
🔴 Explanation: Smoking is the most significant risk factor for transitional cell carcinoma
due to carcinogenic metabolites excreted in urine.
4. A researcher studies a patient with damage to Broca area. Which deficit is expected?
, A. Fluent speech with poor comprehension
B. Inability to recognize faces
C. Nonfluent speech with intact comprehension
D. Loss of hearing bilaterally
🟢 Correct Answer: C. Nonfluent speech with intact comprehension
🔴 Explanation: Broca aphasia causes impaired speech production while comprehension
remains relatively preserved.
5. A 3-year-old child has recurrent bacterial infections and absent thymic shadow on
chest imaging. Which embryologic structure failed to develop properly?
A. First pharyngeal pouch
B. Second pharyngeal arch
C. Third pharyngeal pouch
D. Neural crest-derived notochord
🟢 Correct Answer: C. Third pharyngeal pouch
🔴 Explanation: The thymus and inferior parathyroids derive from the third pharyngeal
pouch. Failure causes DiGeorge syndrome.
6. A patient taking lisinopril develops persistent cough. Which substance is increased
due to ACE inhibition?
DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
CORE DOMAINS*
• Anatomy and Embryology
• Physiology and Pathophysiology
• Biochemistry and Molecular Biology
• Microbiology and Immunology
• Pharmacology
• Pathology
• Behavioral Science and Ethics
• Osteopathic Principles and Practice
• Clinical Reasoning and Patient Management
• Epidemiology and Preventive Medicine
INTRODUCTION*
This assessment is designed to evaluate comprehensive foundational medical knowledge and
clinical reasoning skills required for success on the COMSAE Phase 1 examination. The exam
emphasizes integration of biomedical sciences with patient-centered clinical applications
through multiple-choice and scenario-based questions. Candidates are tested on diagnostic
,interpretation, disease mechanisms, pharmacologic management, ethics, preventive
medicine, and osteopathic principles. Questions are structured to assess analytical thinking,
decision-making, and the ability to apply core scientific concepts to realistic healthcare
situations. This format mirrors professional board-style examinations and promotes
readiness for complex clinical problem-solving encountered in medical training and patient
care.
SECTION ONE: QUESTIONS 1–50
1. A 24-year-old man presents with episodic wheezing and shortness of breath after
exposure to pollen. Which immunoglobulin is primarily responsible for the immediate
hypersensitivity reaction?
A. IgA
B. IgE
C. IgM
D. IgG
🟢 Correct Answer: B. IgE
🔴 Explanation: IgE mediates type I hypersensitivity reactions by binding mast cells and
basophils, leading to histamine release after allergen exposure.
2. A patient with uncontrolled diabetes mellitus develops ketoacidosis. Which enzyme is
primarily responsible for ketone body formation?
,A. HMG-CoA synthase
B. Pyruvate kinase
C. Glycogen phosphorylase
D. Acetyl-CoA carboxylase
🟢 Correct Answer: A. HMG-CoA synthase
🔴 Explanation: HMG-CoA synthase is the rate-limiting enzyme in ketogenesis occurring
within hepatic mitochondria.
3. A 67-year-old smoker presents with hematuria. Biopsy confirms transitional cell
carcinoma of the bladder. Which risk factor is most strongly associated with this
cancer?
A. Asbestos exposure
B. Alcohol consumption
C. Cigarette smoking
D. Ultraviolet radiation
🟢 Correct Answer: C. Cigarette smoking
🔴 Explanation: Smoking is the most significant risk factor for transitional cell carcinoma
due to carcinogenic metabolites excreted in urine.
4. A researcher studies a patient with damage to Broca area. Which deficit is expected?
, A. Fluent speech with poor comprehension
B. Inability to recognize faces
C. Nonfluent speech with intact comprehension
D. Loss of hearing bilaterally
🟢 Correct Answer: C. Nonfluent speech with intact comprehension
🔴 Explanation: Broca aphasia causes impaired speech production while comprehension
remains relatively preserved.
5. A 3-year-old child has recurrent bacterial infections and absent thymic shadow on
chest imaging. Which embryologic structure failed to develop properly?
A. First pharyngeal pouch
B. Second pharyngeal arch
C. Third pharyngeal pouch
D. Neural crest-derived notochord
🟢 Correct Answer: C. Third pharyngeal pouch
🔴 Explanation: The thymus and inferior parathyroids derive from the third pharyngeal
pouch. Failure causes DiGeorge syndrome.
6. A patient taking lisinopril develops persistent cough. Which substance is increased
due to ACE inhibition?
