DENTAL ADMISSION TEST (DAT)
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES ||
100% GUARANTEED PASS!!
<LATEST VERSION>
SECTION I: SURVEY OF NATURAL SCIENCES
(Biology, General Chemistry, Organic Chemistry)
Biology
1. A mutation that alters the reading frame of a gene is most likely caused by
A. a silent substitution
B. a missense mutation
C. an insertion of two nucleotides
D. a deletion of three nucleotides
E. a substitution at the wobble position
Correct Answer: C
Rationale: Insertions or deletions not in multiples of three shift the reading frame,
altering all downstream codons. Silent and missense mutations do not affect the
reading frame.
,2. Which structure is directly responsible for ATP synthesis during oxidative
phosphorylation?
A. Inner mitochondrial membrane
B. Outer mitochondrial membrane
C. Mitochondrial matrix
D. Intermembrane space
E. Cristae lumen
Correct Answer: A
Rationale: ATP synthase is embedded in the inner mitochondrial membrane,
where the proton gradient drives ATP production.
3. During meiosis, homologous chromosomes separate during
A. Prophase I
B. Metaphase I
C. Anaphase I
D. Anaphase II
E. Telophase II
Correct Answer: C
Rationale: Homologous chromosomes separate during anaphase I; sister
chromatids separate in anaphase II.
4. Which of the following best explains why enzymes are specific to their
substrates?
A. Covalent bonding between enzyme and substrate
B. Shape and chemical complementarity
C. Random collision frequency
D. High substrate concentration
E. Enzyme denaturation
Correct Answer: B
Rationale: Enzyme specificity arises from structural and chemical
complementarity between the active site and substrate.
,5. A cell placed in a hypotonic solution will most likely
A. shrink due to water loss
B. swell due to water influx
C. remain unchanged
D. undergo active transport
E. lyse only if it lacks mitochondria
Correct Answer: B
Rationale: In hypotonic solutions, water enters the cell by osmosis, causing
swelling.
General Chemistry
6. Which factor increases the rate of a chemical reaction?
A. Decreasing temperature
B. Increasing activation energy
C. Adding a catalyst
D. Decreasing reactant concentration
E. Lowering surface area
Correct Answer: C
Rationale: Catalysts lower activation energy, increasing reaction rate without
being consumed.
7. Which of the following solutions has the lowest pH?
A. 0.1 M NaCl
B. 0.1 M NH₃
C. 0.01 M HCl
D. 0.001 M NaOH
E. Pure water
Correct Answer: C
Rationale: HCl is a strong acid. A higher hydrogen ion concentration corresponds
to lower pH.
, 8. According to the ideal gas law, decreasing volume while holding temperature
constant will
A. decrease pressure
B. increase pressure
C. decrease number of moles
D. increase temperature
E. have no effect
Correct Answer: B
Rationale: Boyle’s law states that pressure is inversely proportional to volume at
constant temperature.
9. Which intermolecular force is strongest in water?
A. London dispersion
B. Dipole–dipole
C. Ionic bonding
D. Hydrogen bonding
E. Covalent bonding
Correct Answer: D
Rationale: Hydrogen bonding dominates intermolecular attraction in water, giving
it unique properties.
10. The oxidation number of sulfur in SO₄²⁻ is
A. −2
B. +2
C. +4
D. +6
E. 0
Correct Answer: D
Rationale: Oxygen is −2 each (4 × −2 = −8). To result in −2 overall charge, sulfur
must be +6.
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES ||
100% GUARANTEED PASS!!
<LATEST VERSION>
SECTION I: SURVEY OF NATURAL SCIENCES
(Biology, General Chemistry, Organic Chemistry)
Biology
1. A mutation that alters the reading frame of a gene is most likely caused by
A. a silent substitution
B. a missense mutation
C. an insertion of two nucleotides
D. a deletion of three nucleotides
E. a substitution at the wobble position
Correct Answer: C
Rationale: Insertions or deletions not in multiples of three shift the reading frame,
altering all downstream codons. Silent and missense mutations do not affect the
reading frame.
,2. Which structure is directly responsible for ATP synthesis during oxidative
phosphorylation?
A. Inner mitochondrial membrane
B. Outer mitochondrial membrane
C. Mitochondrial matrix
D. Intermembrane space
E. Cristae lumen
Correct Answer: A
Rationale: ATP synthase is embedded in the inner mitochondrial membrane,
where the proton gradient drives ATP production.
3. During meiosis, homologous chromosomes separate during
A. Prophase I
B. Metaphase I
C. Anaphase I
D. Anaphase II
E. Telophase II
Correct Answer: C
Rationale: Homologous chromosomes separate during anaphase I; sister
chromatids separate in anaphase II.
4. Which of the following best explains why enzymes are specific to their
substrates?
A. Covalent bonding between enzyme and substrate
B. Shape and chemical complementarity
C. Random collision frequency
D. High substrate concentration
E. Enzyme denaturation
Correct Answer: B
Rationale: Enzyme specificity arises from structural and chemical
complementarity between the active site and substrate.
,5. A cell placed in a hypotonic solution will most likely
A. shrink due to water loss
B. swell due to water influx
C. remain unchanged
D. undergo active transport
E. lyse only if it lacks mitochondria
Correct Answer: B
Rationale: In hypotonic solutions, water enters the cell by osmosis, causing
swelling.
General Chemistry
6. Which factor increases the rate of a chemical reaction?
A. Decreasing temperature
B. Increasing activation energy
C. Adding a catalyst
D. Decreasing reactant concentration
E. Lowering surface area
Correct Answer: C
Rationale: Catalysts lower activation energy, increasing reaction rate without
being consumed.
7. Which of the following solutions has the lowest pH?
A. 0.1 M NaCl
B. 0.1 M NH₃
C. 0.01 M HCl
D. 0.001 M NaOH
E. Pure water
Correct Answer: C
Rationale: HCl is a strong acid. A higher hydrogen ion concentration corresponds
to lower pH.
, 8. According to the ideal gas law, decreasing volume while holding temperature
constant will
A. decrease pressure
B. increase pressure
C. decrease number of moles
D. increase temperature
E. have no effect
Correct Answer: B
Rationale: Boyle’s law states that pressure is inversely proportional to volume at
constant temperature.
9. Which intermolecular force is strongest in water?
A. London dispersion
B. Dipole–dipole
C. Ionic bonding
D. Hydrogen bonding
E. Covalent bonding
Correct Answer: D
Rationale: Hydrogen bonding dominates intermolecular attraction in water, giving
it unique properties.
10. The oxidation number of sulfur in SO₄²⁻ is
A. −2
B. +2
C. +4
D. +6
E. 0
Correct Answer: D
Rationale: Oxygen is −2 each (4 × −2 = −8). To result in −2 overall charge, sulfur
must be +6.
