COMSAE Phase 1 – Form ASA 115 (Secure
Browser Testing Standard; Videos) (2026
Edition): Comprehensive Multiple-Choice
Questions, Answers, and Detailed Rationales
1. A researcher inserts a gene encoding a human protein
into a bacterial plasmid. Which enzyme is required to seal
the DNA fragments together?
A. DNA polymerase I
B. Helicase
C. Topoisomerase II
D. DNA ligase
E. Primase
DNA ligase forms phosphodiester bonds between adjacent
DNA fragments, making it essential for recombinant DNA
technology. DNA polymerase synthesizes DNA, helicase
unwinds DNA, topoisomerase relieves supercoiling, and
primase synthesizes RNA primers.
2. A patient develops nephrotic syndrome with selective
albuminuria. Which glomerular structure is most likely
damaged?
A. Fenestrated endothelium
B. Mesangial cells
,C. Bowman capsule
D. Juxtaglomerular apparatus
E. Podocyte foot processes
Podocyte foot processes and their slit diaphragms are critical
barriers preventing albumin loss. Damage causes selective
proteinuria, a hallmark of many nephrotic syndromes.
3. Which electrolyte abnormality is most likely to produce
peaked T waves on ECG?
A. Hypocalcemia
B. Hypercalcemia
C. Hypokalemia
D. Hyperkalemia
E. Hypernatremia
Hyperkalemia causes characteristic ECG changes including
peaked T waves, prolonged PR interval, widened QRS
complexes, and eventual sine-wave patterns if severe.
4. A patient has elevated serum calcium and low serum
phosphate. Which hormone is likely increased?
A. Calcitonin
B. Aldosterone
C. Cortisol
D. Growth hormone
E. Parathyroid hormone
,Parathyroid hormone increases serum calcium by stimulating
bone resorption, enhancing renal calcium reabsorption, and
activating vitamin D. It simultaneously promotes phosphate
excretion.
5. Which cranial nerve carries parasympathetic fibers
responsible for pupillary constriction?
A. CN II
B. CN IV
C. CN V
D. CN III
E. CN VI
The oculomotor nerve carries parasympathetic fibers to the
sphincter pupillae muscle through the ciliary ganglion,
producing pupillary constriction.
6. A deficiency of glucose-6-phosphate dehydrogenase
primarily impairs production of:
A. ATP
B. Glycogen
C. Acetyl-CoA
D. Lactate
E. NADPH
G6PD catalyzes the rate-limiting step of the pentose
phosphate pathway, generating NADPH, which protects red
blood cells from oxidative damage.
, 7. Which immune cell is most responsible for immediate
allergic reactions?
A. Neutrophil
B. Macrophage
C. B lymphocyte
D. Mast cell
E. NK cell
Mast cells possess surface IgE receptors. Cross-linking by
allergens triggers rapid degranulation and release of
histamine and other inflammatory mediators.
8. The Frank-Starling mechanism describes the relationship
between:
A. Blood pressure and heart rate
B. Contractility and afterload
C. Ventricular filling and stroke volume
D. Oxygen consumption and cardiac output
E. Heart rate and venous return
Increased ventricular filling stretches myocardial fibers,
leading to stronger contractions and greater stroke volume.
9. A patient presents with microcytic anemia and elevated
total iron-binding capacity. The most likely diagnosis is:
A. Thalassemia major
B. Sideroblastic anemia
Browser Testing Standard; Videos) (2026
Edition): Comprehensive Multiple-Choice
Questions, Answers, and Detailed Rationales
1. A researcher inserts a gene encoding a human protein
into a bacterial plasmid. Which enzyme is required to seal
the DNA fragments together?
A. DNA polymerase I
B. Helicase
C. Topoisomerase II
D. DNA ligase
E. Primase
DNA ligase forms phosphodiester bonds between adjacent
DNA fragments, making it essential for recombinant DNA
technology. DNA polymerase synthesizes DNA, helicase
unwinds DNA, topoisomerase relieves supercoiling, and
primase synthesizes RNA primers.
2. A patient develops nephrotic syndrome with selective
albuminuria. Which glomerular structure is most likely
damaged?
A. Fenestrated endothelium
B. Mesangial cells
,C. Bowman capsule
D. Juxtaglomerular apparatus
E. Podocyte foot processes
Podocyte foot processes and their slit diaphragms are critical
barriers preventing albumin loss. Damage causes selective
proteinuria, a hallmark of many nephrotic syndromes.
3. Which electrolyte abnormality is most likely to produce
peaked T waves on ECG?
A. Hypocalcemia
B. Hypercalcemia
C. Hypokalemia
D. Hyperkalemia
E. Hypernatremia
Hyperkalemia causes characteristic ECG changes including
peaked T waves, prolonged PR interval, widened QRS
complexes, and eventual sine-wave patterns if severe.
4. A patient has elevated serum calcium and low serum
phosphate. Which hormone is likely increased?
A. Calcitonin
B. Aldosterone
C. Cortisol
D. Growth hormone
E. Parathyroid hormone
,Parathyroid hormone increases serum calcium by stimulating
bone resorption, enhancing renal calcium reabsorption, and
activating vitamin D. It simultaneously promotes phosphate
excretion.
5. Which cranial nerve carries parasympathetic fibers
responsible for pupillary constriction?
A. CN II
B. CN IV
C. CN V
D. CN III
E. CN VI
The oculomotor nerve carries parasympathetic fibers to the
sphincter pupillae muscle through the ciliary ganglion,
producing pupillary constriction.
6. A deficiency of glucose-6-phosphate dehydrogenase
primarily impairs production of:
A. ATP
B. Glycogen
C. Acetyl-CoA
D. Lactate
E. NADPH
G6PD catalyzes the rate-limiting step of the pentose
phosphate pathway, generating NADPH, which protects red
blood cells from oxidative damage.
, 7. Which immune cell is most responsible for immediate
allergic reactions?
A. Neutrophil
B. Macrophage
C. B lymphocyte
D. Mast cell
E. NK cell
Mast cells possess surface IgE receptors. Cross-linking by
allergens triggers rapid degranulation and release of
histamine and other inflammatory mediators.
8. The Frank-Starling mechanism describes the relationship
between:
A. Blood pressure and heart rate
B. Contractility and afterload
C. Ventricular filling and stroke volume
D. Oxygen consumption and cardiac output
E. Heart rate and venous return
Increased ventricular filling stretches myocardial fibers,
leading to stronger contractions and greater stroke volume.
9. A patient presents with microcytic anemia and elevated
total iron-binding capacity. The most likely diagnosis is:
A. Thalassemia major
B. Sideroblastic anemia
