COMSAE PHASE 1 FORM 116 PRACTICE EXAM – QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE
CORE DOMAINS
Foundational Biomedical Sciences (Biochemistry, Genetics, Anatomy)
Physiology and Pathophysiology
Pharmacology and Therapeutics
Microbiology and Immunology
Clinical Reasoning and Diagnostic Decision-Making
Ethics, Professionalism, and Legal Issues
Public Health and Preventive Medicine
Pathology and Histology
, INTRODUCTION
The purpose of this practice exam is to prepare candidates for the rigors of the COMSAE
Phase 1 examination. This assessment evaluates foundational biomedical knowledge
and the ability to apply scientific principles to clinical scenarios. Through a series of
multiple-choice and complex vignette-based questions, candidates will demonstrate their
capacity for critical thinking, differential diagnosis, and evidence-based decision-making.
By emphasizing real-world clinical application, this resource ensures that test-takers are
proficient in integrating basic science concepts with patient-centered care, regulatory
standards, and ethical practice, thereby ensuring readiness for the high-stakes
environment of medical licensure assessment.
SECTION ONE: QUESTIONS 1–50
A 45-year-old male presents with fatigue and joint pain. Labs show elevated serum
iron and ferritin. Which gene mutation is most likely responsible?
A. HFE
B. CFTR
C. FBN1
D. DMD
,🟢 Correct Answer: A. HFE
🔴 Explanation: The patient exhibits signs of hereditary hemochromatosis, which is most
commonly caused by a mutation in the HFE gene, leading to excessive iron absorption.
A patient with a history of asthma experiences bronchospasm after taking a non-
selective beta-blocker for hypertension. Which receptor blockade caused this?
A. Alpha-1
B. Beta-1
C. Beta-2
D. Muscarinic
🟢 Correct Answer: C. Beta-2
🔴 Explanation: Beta-2 receptors mediate bronchial smooth muscle relaxation. Blocking
them in asthmatic patients leads to unopposed bronchoconstriction.
Which of the following cells is responsible for the production of osteoid in bone
remodeling?
A. Osteoclast
B. Osteoblast
C. Osteocyte
D. Chondroblast
, 🟢 Correct Answer: B. Osteoblast
🔴 Explanation: Osteoblasts are the bone-forming cells responsible for synthesizing and
secreting osteoid, the organic matrix of bone.
A 60-year-old female presents with resting tremor and bradykinesia. Which area of
the brain is primarily affected?
A. Substantia nigra
B. Cerebellum
C. Hippocampus
D. Amygdala
🟢 Correct Answer: A. Substantia nigra
🔴 Explanation: Parkinson’s disease is caused by the degeneration of dopaminergic
neurons in the substantia nigra pars compacta.
Which enzyme is the rate-limiting step in cholesterol synthesis?
A. HMG-CoA reductase
B. Acetyl-CoA carboxylase
C. Isocitrate dehydrogenase
D. Glycogen phosphorylase
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE
CORE DOMAINS
Foundational Biomedical Sciences (Biochemistry, Genetics, Anatomy)
Physiology and Pathophysiology
Pharmacology and Therapeutics
Microbiology and Immunology
Clinical Reasoning and Diagnostic Decision-Making
Ethics, Professionalism, and Legal Issues
Public Health and Preventive Medicine
Pathology and Histology
, INTRODUCTION
The purpose of this practice exam is to prepare candidates for the rigors of the COMSAE
Phase 1 examination. This assessment evaluates foundational biomedical knowledge
and the ability to apply scientific principles to clinical scenarios. Through a series of
multiple-choice and complex vignette-based questions, candidates will demonstrate their
capacity for critical thinking, differential diagnosis, and evidence-based decision-making.
By emphasizing real-world clinical application, this resource ensures that test-takers are
proficient in integrating basic science concepts with patient-centered care, regulatory
standards, and ethical practice, thereby ensuring readiness for the high-stakes
environment of medical licensure assessment.
SECTION ONE: QUESTIONS 1–50
A 45-year-old male presents with fatigue and joint pain. Labs show elevated serum
iron and ferritin. Which gene mutation is most likely responsible?
A. HFE
B. CFTR
C. FBN1
D. DMD
,🟢 Correct Answer: A. HFE
🔴 Explanation: The patient exhibits signs of hereditary hemochromatosis, which is most
commonly caused by a mutation in the HFE gene, leading to excessive iron absorption.
A patient with a history of asthma experiences bronchospasm after taking a non-
selective beta-blocker for hypertension. Which receptor blockade caused this?
A. Alpha-1
B. Beta-1
C. Beta-2
D. Muscarinic
🟢 Correct Answer: C. Beta-2
🔴 Explanation: Beta-2 receptors mediate bronchial smooth muscle relaxation. Blocking
them in asthmatic patients leads to unopposed bronchoconstriction.
Which of the following cells is responsible for the production of osteoid in bone
remodeling?
A. Osteoclast
B. Osteoblast
C. Osteocyte
D. Chondroblast
, 🟢 Correct Answer: B. Osteoblast
🔴 Explanation: Osteoblasts are the bone-forming cells responsible for synthesizing and
secreting osteoid, the organic matrix of bone.
A 60-year-old female presents with resting tremor and bradykinesia. Which area of
the brain is primarily affected?
A. Substantia nigra
B. Cerebellum
C. Hippocampus
D. Amygdala
🟢 Correct Answer: A. Substantia nigra
🔴 Explanation: Parkinson’s disease is caused by the degeneration of dopaminergic
neurons in the substantia nigra pars compacta.
Which enzyme is the rate-limiting step in cholesterol synthesis?
A. HMG-CoA reductase
B. Acetyl-CoA carboxylase
C. Isocitrate dehydrogenase
D. Glycogen phosphorylase
