Test de práctica DAT
Las preguntas del test siguen en inglés.
Esta es una muestra gratis de 15 preguntas para el Dental Admission Test, escrita por el equipo de StudyPDF. Sigue la forma del examen real: biología, química general y química orgánica del Survey of the Natural Sciences, dos preguntas sobre el razonamiento que hay detrás de las tareas del Perceptual Ability Test, tres textos cortos de lectura y cuatro preguntas cuantitativas. Responde las 15, después mira tu puntuación y lee la explicación de cada pregunta.
During which phase of mitosis do the sister chromatids separate and begin moving toward opposite poles?
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Las 15 preguntas de un vistazo
¿Prefieres leer antes de jugar? Abajo están todas las preguntas de la muestra. Las respuestas y explicaciones quedan plegadas hasta que las abras.
1. During which phase of mitosis do the sister chromatids separate and begin moving toward opposite poles?
- A. Prophase
- B. Metaphase
- C. Anaphase
- D. Telophase
Ver respuesta y explicación
Respuesta: C. Anaphase
Metaphase is the lineup, with the chromosomes held at the middle of the cell by spindle fibers from both poles. Anaphase begins when the protein holding the sister chromatids together is cut, so each chromatid is pulled away and now counts as its own chromosome. Telophase is the cleanup, when nuclear envelopes reform around the two new sets.
2. Which of the following are true of prokaryotic cells?
Marca todas las que correspondan.
- A. They have no membrane bound nucleus
- B. Their genome is usually a single circular chromosome sitting in the nucleoid region
- C. They build proteins on ribosomes
- D. They divide by mitosis
- E. They carry out aerobic respiration inside mitochondria
Ver respuesta y explicación
Respuesta: A. They have no membrane bound nucleus, B. Their genome is usually a single circular chromosome sitting in the nucleoid region, C. They build proteins on ribosomes
Prokaryotes have no nucleus and no membrane bound organelles, so their DNA sits loose in a region called the nucleoid, usually as one circular chromosome plus optional plasmids. They do have ribosomes, because every cell needs them to make protein, though prokaryotic ribosomes are smaller than eukaryotic ones and that difference is what several antibiotics exploit. They divide by binary fission rather than mitosis, and the enzymes of aerobic respiration sit in the plasma membrane because there are no mitochondria.
3. Moving from left to right across a period of the periodic table, atomic radius generally:
- A. increases, because each atom holds more electrons
- B. decreases, because the growing nuclear charge pulls the same shell in tighter
- C. stays about the same, because the principal energy level does not change
- D. increases, because inner electrons shield the outer ones more effectively
Ver respuesta y explicación
Respuesta: B. decreases, because the growing nuclear charge pulls the same shell in tighter
Across a period, protons are added to the nucleus while the new electrons go into the same principal energy level, so shielding barely changes and the effective nuclear charge felt by the outer electrons climbs. That stronger pull draws the whole electron cloud in, so the radius shrinks. Down a group the opposite happens, because each step adds a whole new shell and that outweighs the extra protons.
4. Complete the sentence.
At 0 degrees Celsius and 1 atmosphere of pressure, one mole of an ideal gas occupies about _____ liters.
Opciones para el hueco 1: 11.2, 22.4, 44.8, 62.4
Ver respuesta y explicación
Respuesta: 22.4
Rearranging PV equals nRT gives V equal to nRT over P, and with n as 1 mole, R as 0.0821 liter atmospheres per mole kelvin and T as 273 kelvin, the volume comes out near 22.4 liters. The useful part is that the ideal gas law never mentions the identity of the gas, so a mole of helium and a mole of carbon dioxide occupy the same volume under the same conditions. Change the temperature or the pressure and that 22.4 changes with it, which is why the conditions have to be stated.
5. An SN2 reaction proceeds fastest with which substrate?
- A. A primary alkyl halide
- B. A secondary alkyl halide with two bulky neighboring groups
- C. A tertiary alkyl halide
- D. A carbon bonded to four other carbon atoms
Ver respuesta y explicación
Respuesta: A. A primary alkyl halide
SN2 happens in one step, with the nucleophile attacking the back side of the carbon at the same moment the leaving group departs. Anything crowding that back side slows it down, so the least substituted carbon reacts fastest and the rate order runs primary, then secondary, then tertiary. Tertiary halides go the other route, SN1, because they form a relatively stable carbocation, and a carbon already bonded to four carbons has no leaving group to lose in the first place.
6. Complete the sentence.
A molecule with 3 stereocenters and no internal plane of symmetry has at most _____ stereoisomers, and each one of those has exactly _____ enantiomer.
Opciones para el hueco 1: 3, 6, 8, 9
Opciones para el hueco 2: 0, 1, 2, 3
Ver respuesta y explicación
Respuesta: 8, 1
Each stereocenter can be set two ways, so n stereocenters give a maximum of 2 to the power of n stereoisomers, and 2 cubed is 8. An enantiomer is the complete mirror image, meaning every stereocenter is inverted, so any structure has one and only one. Every other member of the set is a diastereomer. The word maximum matters, because internal symmetry can make one structure identical to its own mirror image, a meso compound, which cuts the real count below 2 to the n.
7. A solid block is built from 8 identical cubes stacked 2 by 2 by 2. The entire outside of the block, including the bottom, is painted. How many of the 8 cubes have exactly 3 painted faces?
- A. 0
- B. 4
- C. 6
- D. 8
Ver respuesta y explicación
Respuesta: D. 8
In a 2 by 2 by 2 block every small cube sits at a corner of the big cube, and a corner exposes exactly three faces, so all 8 qualify. The general logic is worth holding onto: in a 3 by 3 by 3 painted on every side, the 8 corners show 3 faces, the 12 edge cubes show 2, the 6 face centers show 1 and the single buried cube shows none. Note that the real cube counting subtest shows you a picture and normally leaves the bottom unpainted, so read the on-screen instructions before you start counting.
8. A square sheet of paper is folded in half, then folded in half again along the other direction. A single hole is punched through all the layers, away from any crease. Which statements are true once the sheet is unfolded?
Marca todas las que correspondan.
- A. The unfolded sheet has four holes
- B. Each fold doubles the number of holes a single punch produces
- C. The holes sit symmetrically about the creases
- D. The unfolded sheet has one hole
- E. The number of holes does not depend on how many times the paper was folded
Ver respuesta y explicación
Respuesta: A. The unfolded sheet has four holes, B. Each fold doubles the number of holes a single punch produces, C. The holes sit symmetrically about the creases
Two folds stack four layers of paper, and one punch goes through all four, so unfolding reveals four holes. Each crease behaves like a mirror, which is why the punched hole reappears reflected across every fold line and the final pattern is symmetric about both creases. Reasoning it out this way is the fast route on the real hole punching subtest, which is visual: it shows you a folding sequence and asks you to pick the resulting pattern on a grid, so practice it with actual diagrams.
9. Read the passage, then answer the question. Tooth enamel is the hardest tissue in the human body, and it is built almost entirely from a mineral called hydroxyapatite. Unlike bone, mature enamel contains no living cells, so once it is formed it cannot grow new tissue the way a fracture in bone knits itself back together. What enamel can do is trade minerals with the fluid sitting on it. When the mouth turns acidic, calcium and phosphate leave the surface. When that acid is buffered away, the same ions can move back in and rebuild the damaged crystal, a process called remineralization. According to the passage, why can enamel not repair itself the way bone does?
- A. Enamel is softer than bone
- B. Mature enamel contains no living cells
- C. Enamel is not made of mineral
- D. Enamel never loses calcium or phosphate
Ver respuesta y explicación
Respuesta: B. Mature enamel contains no living cells
The passage draws the contrast in one sentence: bone heals because it is living tissue, and mature enamel has no cells to do that work. Remineralization is a chemical exchange of ions, not cellular repair, which is exactly why the passage describes it as rebuilding a crystal rather than growing tissue. DAT reading rewards answers you can put a finger on in the text, and the other three options either contradict the passage or are never mentioned.
10. Read the passage, then answer the question. A biofilm is a community of microorganisms stuck to a surface inside a layer of material the cells secrete themselves. Dental plaque is the example most people meet daily. Within hours of a cleaning, proteins from saliva coat the tooth and form a thin film, and the first bacteria to arrive attach to that film rather than to the enamel itself. Later species then attach to the earlier ones. Because the secreted layer slows the movement of antimicrobial agents, and because cells inside a biofilm behave differently from free floating ones, a mature biofilm is much harder to kill than the same species grown loose in liquid. Which statements are supported by the passage?
Marca todas las que correspondan.
- A. The first bacteria attach to a film of salivary protein rather than directly to enamel
- B. A mature biofilm resists antimicrobial agents better than the same bacteria growing loose in liquid
- C. The bacteria in a biofilm produce the material that surrounds them
- D. Plaque takes several weeks to start forming after a cleaning
- E. Every species in plaque attaches to the tooth at the same moment
Ver respuesta y explicación
Respuesta: A. The first bacteria attach to a film of salivary protein rather than directly to enamel, B. A mature biofilm resists antimicrobial agents better than the same bacteria growing loose in liquid, C. The bacteria in a biofilm produce the material that surrounds them
The first three restate the passage: the salivary film comes first, the surrounding layer is secreted by the cells themselves, and the passage gives two reasons a mature biofilm resists antimicrobials. The other two are contradicted. The passage says the film appears within hours, not weeks, and it describes attachment as a sequence in which later species attach to earlier ones. On a select all that apply item, check each option against the text separately rather than picking the ones that feel right together.
11. Read the passage, then answer the question. Saliva does more than moisten food. It carries bicarbonate and phosphate, which neutralize acid, and it washes fermentable sugar away from the tooth surface. After a sugary drink, plaque bacteria produce acid within minutes and the pH near the enamel drops. Saliva then pulls that pH back up over the following twenty to sixty minutes. That recovery window is why dentists pay more attention to how often a person sips a sweet drink than to how large the drink is. Ten sips spread across an afternoon hold the surface at a low pH far longer than the same volume swallowed at once. The passage suggests that the greatest risk to enamel comes from:
- A. the total volume of sugary drink consumed
- B. the concentration of bicarbonate in saliva
- C. how frequently a sugary drink is sipped
- D. swallowing a sugary drink quickly in one sitting
Ver respuesta y explicación
Respuesta: C. how frequently a sugary drink is sipped
The passage ties damage to how long the surface stays at a low pH, and it says saliva needs twenty to sixty minutes to recover. Frequent sipping restarts the acid drop before that recovery finishes, so the surface spends more total time acidic even though the volume is unchanged. The last option is the one the passage explicitly compares against and rejects. Inference questions still have to rest on the text, so trace the chain of sentences that gets you there.
12. A dental material is mixed from powder and water in a 2 to 5 ratio by weight. How many grams of powder are needed to make 350 grams of mixture?
- A. 100 grams
- B. 140 grams
- C. 175 grams
- D. 250 grams
Ver respuesta y explicación
Respuesta: A. 100 grams
A 2 to 5 ratio means the mixture splits into 7 equal parts, 2 of them powder and 5 of them water, so the powder is 2 sevenths of the total. Two sevenths of 350 is 100 grams, leaving 250 grams of water. The common trap is treating 2 to 5 as 2 out of 5 and answering 140. Ratios compare the parts to each other, and you have to add them before you compare either one to the whole.
13. A bag holds 4 red, 3 blue and 5 green marbles. Two marbles are drawn without replacement. What is the probability that both are green?
- A. 25/144
- B. 5/36
- C. 1/6
- D. 5/33
Ver respuesta y explicación
Respuesta: D. 5/33
There are 12 marbles, so the first draw is green with probability 5 over 12. Because the marble is not replaced, the second draw is green with probability 4 over 11, since only 4 green marbles remain out of 11. Multiplying gives 20 over 132, which reduces to 5 over 33. The 25 over 144 answer is what you get if you replace the first marble, so read for the words with or without replacement before you set up the fractions.
14. Complete the sentence.
A solution is 15 percent salt by weight, so a 40 gram sample of that solution contains _____ grams of salt.
Opciones para el hueco 1: 6, 15, 24, 40
Ver respuesta y explicación
Respuesta: 6
Percent means parts per hundred, so 15 percent is the decimal 0.15, and 0.15 times 40 gives 6 grams. The other 34 grams are water. The step people skip is checking what the percentage is a percentage of, because by weight means the 40 grams is the total mass of the solution, not the mass of the water it was dissolved into.
15. If 3x minus 7 equals 2x plus 5, what is the value of x squared?
- A. 25
- B. 121
- C. 144
- D. 169
Ver respuesta y explicación
Respuesta: C. 144
Subtract 2x from both sides to get x minus 7 equals 5, then add 7 to both sides to get x equal to 12, so x squared is 144. Two step questions like this one punish anyone who solves for x and stops, because 12 will not be an option and the wrong habit is to grab whatever looks close. Read the last clause of the question again before you pick.
Qué te pide de verdad el DAT
El Dental Admission Test es un examen por ordenador propiedad de la American Dental Association que se hace en un centro de examen. Tiene cuatro partes. El Survey of the Natural Sciences te da 100 preguntas en 90 minutos, repartidas en 40 de biología, 30 de química general y 30 de química orgánica. El Perceptual Ability Test te da 90 preguntas en 60 minutos. Reading Comprehension te da 50 preguntas en 60 minutos. Quantitative Reasoning te da 40 preguntas en 45 minutos. Con el descanso opcional y la encuesta opcional posterior, la cita dura algo más de cinco horas.
Las puntuaciones se dan como puntuaciones de escala del 1 al 30, y la ADA describe un 19 como un rendimiento más o menos medio a nivel nacional. Recibes una puntuación separada de biología, química general, química orgánica, comprensión lectora, razonamiento cuantitativo y Perceptual Ability Test. La Academic Average es la media redondeada de las cinco puntuaciones académicas, y la perceptiva se deja fuera a propósito, así que el PAT se lee por su cuenta. Por eso las facultades de odontología de Estados Unidos suelen mirar sobre todo esos dos números. Tu puntuación depende de cuántas preguntas aciertas, así que no hay motivo para dejar ninguna en blanco.
Todo lo demás del día se mueve. Las tasas, cada cuánto puedes repetir, la espera entre intentos, qué puedes llevar a la sala y qué herramientas en pantalla te dan durante la sección cuantitativa los fija la ADA y se revisan. Lee la guía del candidato del DAT vigente en ada.org en vez de fiarte de un libro de preparación antiguo, o de esta página.
Cómo usar esta muestra
El DAT real tiene 280 preguntas en cuatro secciones. Quince no pueden sustituir eso, y esta muestra no lo pretende. Lo que sí puede hacer es enseñarte cuál de las cuatro áreas tienes más floja antes de que montes un plan de estudio alrededor del área equivocada. La mezcla de aquí son seis preguntas de ciencias naturales, dos de razonamiento perceptivo, tres textos de lectura y cuatro preguntas cuantitativas.
Las preguntas perceptivas necesitan un aviso. El Perceptual Ability Test real es totalmente visual: ojos de cerradura y aperturas, reconocimiento de vistas superior, frontal y lateral, ordenación de ángulos, perforado de papel, recuento de cubos y plegado de patrones. Una página de texto no puede dibujar eso, y fingir una imagen con palabras te enseñaría hábitos equivocados. Así que las dos preguntas perceptivas de aquí evalúan en su lugar las reglas y el razonamiento que hay detrás de dos de esas tareas. Practica la sección en sí con diagramas de verdad, porque la velocidad en el PAT viene de un reconocimiento de patrones que solo se construye mirando.
Hazla de una sentada y sin apuntes, después lee todas las explicaciones, también las de las que acertaste. Trata una respuesta incorrecta como un tema, no como un dato. Todo lo de aquí lo escribió el equipo de StudyPDF a partir del esquema de contenido del DAT publicado. No son preguntas de la ADA, StudyPDF no está afiliada a la American Dental Association, y nada de esta página es consejo odontológico ni médico. Es práctica de examen.
Cómo StudyPDF crea tests completos con tu material
Quince preguntas pueden señalarte un área débil. No pueden prepararte para un examen de 280 preguntas, y un banco genérico rara vez coincide con la química orgánica que tu profesor subrayó de verdad ni con la biología a la que tu libro del DAT dedica cuarenta páginas.
StudyPDF va por otro camino y trabaja con tu material. Sube tu libro de preparación del DAT, tus apuntes de química general, tus hojas de reacciones orgánicas o las diapositivas de tu itinerario de biología, y Bo, el agente de estudio, crea tests de práctica completos con esas páginas exactas. Cada pregunta sale de lo que subiste, y cada explicación apunta a de dónde vino la respuesta, así que puedes ir directo a la fuente cuando algo parezca raro. Genera un test nuevo cuando quieras, céntralo en un solo área como la estereoquímica o los equilibrios ácido base, y sigue qué conceptos sigues fallando.
No necesitas un archivo para empezar. Si no tienes nada que subir, di solo un tema, por ejemplo el metabolismo de los carbohidratos o los mecanismos de reacción, y Bo escribe un test de práctica con eso. Empezar es gratis.
Escrito por el equipo de StudyPDF. Actualizado el 2026-08-19.