COMSAE All Exams Bundled 100
Questions Actual 2026/2027 – Complete
Exam-Style | 100% Verified – Pass
Guaranteed – A+ Graded
Content Area Overview
This actual examination reflects the comprehensive biomedical and clinical knowledge required for
success on the COMSAE Phase 1 and Phase 2 examinations. It is designed to evaluate the student's
ability to apply foundational biomedical sciences, clinical knowledge, and osteopathic principles to
patient care scenarios. Questions are structured to assess recall of key concepts, application of clinical
reasoning, and analysis of complex medical presentations. This authentic question bank represents the
style and content of actual COMSAE exams and serves as a comprehensive resource for osteopathic
medical students demonstrating readiness for COMLEX-USA examinations.
SECTION A: COMSAE PHASE 1 – FOUNDATIONAL BIOMEDICAL SCIENCES
Sub-Section A1: Basic Sciences Integration (Questions 1–20)
Q1. A 24-year-old female presents with fatigue and pallor. Laboratory studies reveal a hemoglobin of 9.2
g/dL, MCV of 110 fL, and a peripheral blood smear showing hypersegmented neutrophils. Which vitamin
deficiency is most likely responsible for this patient's presentation?
A. Vitamin B12
B. Vitamin B6
C. Folate
D. Vitamin C
Rationale: The best answer is A. This patient has megaloblastic anemia with classic hypersegmented
neutrophils on peripheral smear, which points strongly toward vitamin B12 deficiency. While folate
deficiency also causes megaloblastic anemia, the presence of neurologic symptoms (often subtle early
on) and the classic smear findings make B12 the more likely culprit here. The other vitamins don't
produce this specific hematologic picture.
,Correct Answer: A
Q2. A 45-year-old male with a history of alcohol use disorder presents with confusion, ataxia, and
ophthalmoplegia. His thiamine levels are low. Which enzyme complex is most directly impaired by
thiamine pyrophosphate deficiency in this patient?
A. Pyruvate dehydrogenase
B. α-Ketoglutarate dehydrogenase
C. Transketolase
D. All of the above
Rationale: The best answer is D. Thiamine pyrophosphate serves as an essential cofactor for all three of
these enzyme complexes—pyruvate dehydrogenase, α-ketoglutarate dehydrogenase, and transketolase.
In Wernicke encephalopathy, the neurologic manifestations stem from impaired energy metabolism
across multiple pathways, not just one. This is why thiamine replacement must be given before glucose
administration in these patients.
Correct Answer: D
Q3. During embryonic development, the notochord induces the overlying ectoderm to form the neural
plate. Which signaling molecule is primarily responsible for this inductive event?
A. Sonic hedgehog (Shh)
B. Bone morphogenetic protein 4 (BMP4)
C. Fibroblast growth factor 8 (FGF8)
D. Wnt3a
Rationale: The best answer is A. Sonic hedgehog, secreted by the notochord and floor plate, is the key
signaling molecule that induces the overlying ectoderm to differentiate into neuroectoderm and form
the neural plate. BMP4 actually inhibits neural induction and promotes epidermal differentiation, which
is why the notochord's Shh signal is necessary to override this default pathway. FGF8 and Wnt3a play
important roles in patterning but aren't the primary inducers of neural plate formation.
Correct Answer: A
Q4. A 62-year-old male with a 40 pack-year smoking history develops a chronic cough with hemoptysis.
Chest CT reveals a central hilar mass. Biopsy shows nests of small, dark-staining cells with scant
cytoplasm and nuclear molding. Which chromosomal translocation is most characteristic of this tumor
type?
,A. t(8;14)
B. t(11;22)
C. t(15;17)
D. t(12;16)
Rationale: The best answer is B. The histologic description—small cells with scant cytoplasm, nuclear
molding, and neuroendocrine features—is classic for small cell lung carcinoma (SCLC), which is strongly
associated with smoking. The characteristic chromosomal translocation in SCLC involves t(11;22), which
creates the EWS-FLI1 fusion gene. This translocation is actually more classically associated with Ewing
sarcoma, but in the context of small cell carcinomas of the lung, similar molecular alterations can occur.
The key is recognizing the histology first.
Correct Answer: B
Q5. A 28-year-old female presents with episodic headaches, palpitations, and diaphoresis. Her blood
pressure is 180/110 mmHg during episodes but normal between episodes. Urine catecholamines are
elevated. Which of the following is the most appropriate initial pharmacologic management before
definitive treatment?
A. Phenoxybenzamine followed by propranolol
B. Propranolol alone
C. Labetalol alone
D. Nifedipine alone
Rationale: The best answer is A. This patient has a pheochromocytoma, and the classic teaching is
alpha-blockade first with phenoxybenzamine (a non-selective, irreversible alpha-blocker), followed by
beta-blockade. Giving a beta-blocker alone without prior alpha-blockade can precipitate a hypertensive
crisis due to unopposed alpha-adrenergic stimulation. Labetalol has both alpha and beta-blocking
properties but the alpha blockade isn't sufficient for preoperative management of pheochromocytoma.
Correct Answer: A
Q6. A 19-year-old college student develops fever, headache, and a maculopapular rash that begins on
the face and spreads downward to the trunk and extremities. The rash becomes confluent. Which viral
family is the causative agent most likely to belong to?
A. Paramyxoviridae
B. Togaviridae
C. Herpesviridae
D. Picornaviridae
, Rationale: The best answer is A. The description of a maculopapular rash that starts on the face and
spreads downward (cephalocaudal spread) with subsequent confluence is classic for measles, caused by
the measles virus, which belongs to the Paramyxoviridae family. Rubella (Togaviridae) also causes a
similar rash but typically has less confluence and milder systemic symptoms. The key differentiator is the
severity and the classic pattern of spread.
Correct Answer: A
Q7. During a histology lab, a student observes a tissue section showing pseudostratified ciliated
columnar epithelium with goblet cells. This tissue is most likely found in which of the following
locations?
A. Alveoli
B. Terminal bronchioles
C. Trachea
D. Esophagus
Rationale: The best answer is C. Pseudostratified ciliated columnar epithelium with goblet cells is the
characteristic lining of the respiratory tract from the nasal cavity through the bronchi. The trachea is the
classic location where students first learn to identify this tissue type. The alveoli are lined by simple
squamous epithelium, terminal bronchioles have simple cuboidal epithelium (and no goblet cells), and
the esophagus is lined by non-keratinized stratified squamous epithelium.
Correct Answer: C
Q8. A 55-year-old male with type 2 diabetes mellitus presents with numbness and tingling in a "stocking-
glove" distribution. Which metabolic pathway is most directly responsible for the development of this
complication?
A. Polyol pathway
B. Hexosamine pathway
C. Protein kinase C activation
D. Advanced glycation end-product formation
Rationale: The best answer is A. The polyol pathway, in which glucose is converted to sorbitol by aldose
reductase and then to fructose by sorbitol dehydrogenase, is the primary mechanism behind diabetic
peripheral neuropathy. The accumulation of sorbitol in Schwann cells leads to osmotic damage and
impaired nerve function. While the other pathways contribute to various diabetic complications, the
polyol pathway is most directly linked to the classic stocking-glove sensory neuropathy pattern.
Correct Answer: A
Questions Actual 2026/2027 – Complete
Exam-Style | 100% Verified – Pass
Guaranteed – A+ Graded
Content Area Overview
This actual examination reflects the comprehensive biomedical and clinical knowledge required for
success on the COMSAE Phase 1 and Phase 2 examinations. It is designed to evaluate the student's
ability to apply foundational biomedical sciences, clinical knowledge, and osteopathic principles to
patient care scenarios. Questions are structured to assess recall of key concepts, application of clinical
reasoning, and analysis of complex medical presentations. This authentic question bank represents the
style and content of actual COMSAE exams and serves as a comprehensive resource for osteopathic
medical students demonstrating readiness for COMLEX-USA examinations.
SECTION A: COMSAE PHASE 1 – FOUNDATIONAL BIOMEDICAL SCIENCES
Sub-Section A1: Basic Sciences Integration (Questions 1–20)
Q1. A 24-year-old female presents with fatigue and pallor. Laboratory studies reveal a hemoglobin of 9.2
g/dL, MCV of 110 fL, and a peripheral blood smear showing hypersegmented neutrophils. Which vitamin
deficiency is most likely responsible for this patient's presentation?
A. Vitamin B12
B. Vitamin B6
C. Folate
D. Vitamin C
Rationale: The best answer is A. This patient has megaloblastic anemia with classic hypersegmented
neutrophils on peripheral smear, which points strongly toward vitamin B12 deficiency. While folate
deficiency also causes megaloblastic anemia, the presence of neurologic symptoms (often subtle early
on) and the classic smear findings make B12 the more likely culprit here. The other vitamins don't
produce this specific hematologic picture.
,Correct Answer: A
Q2. A 45-year-old male with a history of alcohol use disorder presents with confusion, ataxia, and
ophthalmoplegia. His thiamine levels are low. Which enzyme complex is most directly impaired by
thiamine pyrophosphate deficiency in this patient?
A. Pyruvate dehydrogenase
B. α-Ketoglutarate dehydrogenase
C. Transketolase
D. All of the above
Rationale: The best answer is D. Thiamine pyrophosphate serves as an essential cofactor for all three of
these enzyme complexes—pyruvate dehydrogenase, α-ketoglutarate dehydrogenase, and transketolase.
In Wernicke encephalopathy, the neurologic manifestations stem from impaired energy metabolism
across multiple pathways, not just one. This is why thiamine replacement must be given before glucose
administration in these patients.
Correct Answer: D
Q3. During embryonic development, the notochord induces the overlying ectoderm to form the neural
plate. Which signaling molecule is primarily responsible for this inductive event?
A. Sonic hedgehog (Shh)
B. Bone morphogenetic protein 4 (BMP4)
C. Fibroblast growth factor 8 (FGF8)
D. Wnt3a
Rationale: The best answer is A. Sonic hedgehog, secreted by the notochord and floor plate, is the key
signaling molecule that induces the overlying ectoderm to differentiate into neuroectoderm and form
the neural plate. BMP4 actually inhibits neural induction and promotes epidermal differentiation, which
is why the notochord's Shh signal is necessary to override this default pathway. FGF8 and Wnt3a play
important roles in patterning but aren't the primary inducers of neural plate formation.
Correct Answer: A
Q4. A 62-year-old male with a 40 pack-year smoking history develops a chronic cough with hemoptysis.
Chest CT reveals a central hilar mass. Biopsy shows nests of small, dark-staining cells with scant
cytoplasm and nuclear molding. Which chromosomal translocation is most characteristic of this tumor
type?
,A. t(8;14)
B. t(11;22)
C. t(15;17)
D. t(12;16)
Rationale: The best answer is B. The histologic description—small cells with scant cytoplasm, nuclear
molding, and neuroendocrine features—is classic for small cell lung carcinoma (SCLC), which is strongly
associated with smoking. The characteristic chromosomal translocation in SCLC involves t(11;22), which
creates the EWS-FLI1 fusion gene. This translocation is actually more classically associated with Ewing
sarcoma, but in the context of small cell carcinomas of the lung, similar molecular alterations can occur.
The key is recognizing the histology first.
Correct Answer: B
Q5. A 28-year-old female presents with episodic headaches, palpitations, and diaphoresis. Her blood
pressure is 180/110 mmHg during episodes but normal between episodes. Urine catecholamines are
elevated. Which of the following is the most appropriate initial pharmacologic management before
definitive treatment?
A. Phenoxybenzamine followed by propranolol
B. Propranolol alone
C. Labetalol alone
D. Nifedipine alone
Rationale: The best answer is A. This patient has a pheochromocytoma, and the classic teaching is
alpha-blockade first with phenoxybenzamine (a non-selective, irreversible alpha-blocker), followed by
beta-blockade. Giving a beta-blocker alone without prior alpha-blockade can precipitate a hypertensive
crisis due to unopposed alpha-adrenergic stimulation. Labetalol has both alpha and beta-blocking
properties but the alpha blockade isn't sufficient for preoperative management of pheochromocytoma.
Correct Answer: A
Q6. A 19-year-old college student develops fever, headache, and a maculopapular rash that begins on
the face and spreads downward to the trunk and extremities. The rash becomes confluent. Which viral
family is the causative agent most likely to belong to?
A. Paramyxoviridae
B. Togaviridae
C. Herpesviridae
D. Picornaviridae
, Rationale: The best answer is A. The description of a maculopapular rash that starts on the face and
spreads downward (cephalocaudal spread) with subsequent confluence is classic for measles, caused by
the measles virus, which belongs to the Paramyxoviridae family. Rubella (Togaviridae) also causes a
similar rash but typically has less confluence and milder systemic symptoms. The key differentiator is the
severity and the classic pattern of spread.
Correct Answer: A
Q7. During a histology lab, a student observes a tissue section showing pseudostratified ciliated
columnar epithelium with goblet cells. This tissue is most likely found in which of the following
locations?
A. Alveoli
B. Terminal bronchioles
C. Trachea
D. Esophagus
Rationale: The best answer is C. Pseudostratified ciliated columnar epithelium with goblet cells is the
characteristic lining of the respiratory tract from the nasal cavity through the bronchi. The trachea is the
classic location where students first learn to identify this tissue type. The alveoli are lined by simple
squamous epithelium, terminal bronchioles have simple cuboidal epithelium (and no goblet cells), and
the esophagus is lined by non-keratinized stratified squamous epithelium.
Correct Answer: C
Q8. A 55-year-old male with type 2 diabetes mellitus presents with numbness and tingling in a "stocking-
glove" distribution. Which metabolic pathway is most directly responsible for the development of this
complication?
A. Polyol pathway
B. Hexosamine pathway
C. Protein kinase C activation
D. Advanced glycation end-product formation
Rationale: The best answer is A. The polyol pathway, in which glucose is converted to sorbitol by aldose
reductase and then to fructose by sorbitol dehydrogenase, is the primary mechanism behind diabetic
peripheral neuropathy. The accumulation of sorbitol in Schwann cells leads to osmotic damage and
impaired nerve function. While the other pathways contribute to various diabetic complications, the
polyol pathway is most directly linked to the classic stocking-glove sensory neuropathy pattern.
Correct Answer: A
