OAT Practice Test Welcome to your OAT Practice Test 1. OAT: Survey of the Natural Sciences, Biology Which type of bond is primarily responsible for the secondary structure (alpha helices and beta sheets) of proteins? Peptide bonds Hydrogen bonds Disulfide bonds Ionic bonds None 2. OAT: Survey of the Natural Sciences, Biology In genetics, what is the purpose of a Punnett square? To determine the genetic makeup of an individual To predict the outcome of genetic crosses To visualize protein synthesis To track chromosomal changes during meiosis None 3. OAT: Survey of the Natural Sciences, Biology Which of the following best describes the role of peroxisomes in eukaryotic cells? Synthesis of steroid hormones Breakdown of fatty acids and detoxification of harmful substances Conversion of light energy into chemical energy Packaging and sorting of protein products for secretion None 4. OAT: Survey of the Natural Sciences, Biology What is a Barr body? An inactive X chromosome in a male somatic cell An active X chromosome in a female somatic cell An inactive X chromosome in a female somatic cell A visible manifestation of a mutated chromosome None 5. OAT: Survey of the Natural Sciences, Biology Which organelle is primarily responsible for the synthesis of lipids? Golgi apparatus Lysosome Smooth endoplasmic reticulum Mitochondrion None 6. OAT: Survey of the Natural Sciences, Biology Which of the following correctly lists the sequence of events during an action potential? Depolarization, repolarization, hyperpolarization Hyperpolarization, depolarization, repolarization Repolarization, hyperpolarization, depolarization Depolarization, hyperpolarization, repolarization None 7. OAT: Survey of the Natural Sciences, Biology Which process describes the movement of water across a semipermeable membrane from an area of low solute concentration to an area of high solute concentration? Active transport Osmosis Diffusion Endocytosis None 8. OAT: Survey of the Natural Sciences, Biology In a eukaryotic cell, where are proteins synthesized? Nucleolus Ribosomes Golgi apparatus Endoplasmic reticulum None 9. OAT: Survey of the Natural Sciences, Biology What is the significance of the variable regions in antibodies? They determine the class of the antibody. They bind to specific antigens. They facilitate the crossing of the placenta. They are constant in all antibodies of the same class. None 10. OAT: Survey of the Natural Sciences, Biology During which phase of the cell cycle does the chromosome number of a diploid cell become halved? Anaphase of mitosis Telophase of mitosis Anaphase I of meiosis Anaphase II of meiosis None 11. OAT: Survey of the Natural Sciences, Biology In the lac operon, what is the role of the lac repressor? Binds lactose to initiate transcription Binds to the operator to prevent transcription Enhances the binding of RNA polymerase to the promoter Cuts lactose into glucose and galactose None 12. OAT: Survey of the Natural Sciences, Biology What is the primary role of ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) in plants? Glycolysis Calvin cycle Krebs cycle Electron transport chain None 13. OAT: Survey of the Natural Sciences, Biology What role do microtubules play in cell division? They synthesize DNA. They transport organelles. They form the mitotic spindle. They produce ATP. None 14. OAT: Survey of the Natural Sciences, Biology Which pathway correctly represents the flow of electrons during photosynthesis? Water ? NADPH ? Oxygen Water ? Photosystem I ? NADPH Oxygen ? Photosystem II ? NADP+ NADPH ? Photosystem I ? Oxygen None 15. OAT: Survey of the Natural Sciences, Biology Which enzyme is responsible for unwinding the DNA double helix during DNA replication? DNA polymerase Helicase Ligase Topoisomerase None 16. OAT: Survey of the Natural Sciences, Biology What is the main function of the antidiuretic hormone (ADH)? To decrease blood pressure To increase urine production To reduce water reabsorption in the kidneys To increase water reabsorption in the kidneys None 17. OAT: Survey of the Natural Sciences, Biology During the citric acid cycle, which compound donates acetyl groups for the cycle to proceed? Oxaloacetate Acetyl-CoA Citrate Malate None 18. OAT: Survey of the Natural Sciences, General Chemistry Which compound exhibits the highest boiling point? CH4 NH3 H2O HF None 19. OAT: Survey of the Natural Sciences, General Chemistry What is the final electron acceptor in the electron transport chain of aerobic respiration? NAD+ FAD Oxygen Carbon dioxide None 20. OAT: Survey of the Natural Sciences, General Chemistry Which of the following is not true about sigma bonds? Formed by the end-to-end overlap of orbitals They are the first bonds formed between two atoms Allow for free rotation around the bond axis They are weaker than pi bonds None 21. OAT: Survey of the Natural Sciences, General Chemistry A buffer solution is prepared by mixing equal molar amounts of acetic acid and sodium acetate. What is the pH of this buffer if the pKa of acetic acid is 4.76? 4.76 5.76 3.76 7 None 22. OAT: Survey of the Natural Sciences, General Chemistry What is the oxidation state of chromium in the dichromate ion, Cr2O7^2-? 3 6 7 12 None 23. OAT: Survey of the Natural Sciences, General Chemistry When silver nitrate solution is mixed with potassium chloride solution, what type of reaction occurs? Synthesis Decomposition Single displacement Double displacement None 24. OAT: Survey of the Natural Sciences, General Chemistry Which of the following is not a characteristic of a catalyst? Lowers the activation energy of a reaction Is consumed by the reaction Provides an alternative pathway for the reaction Does not shift the position of equilibrium None 25. OAT: Survey of the Natural Sciences, General Chemistry The half-life of a first-order reaction is independent of which of the following? Reaction order Initial concentration Activation energy Temperature None 26. OAT: Survey of the Natural Sciences, General Chemistry In a redox reaction, the element that is oxidized will show a change in oxidation state that is: A decrease An increase No change Periodic None 27. OAT: Survey of the Natural Sciences, General Chemistry In which type of crystal lattice are the lattice points occupied by anions, and cations occupy the holes between them? Molecular crystal Covalent crystal Metallic crystal Ionic crystal None 28. OAT: Survey of the Natural Sciences, General Chemistry What is the molecular geometry of a molecule with a central atom that has two lone pairs and two bond pairs? Linear Bent Tetrahedral Trigonal planar None 29. OAT: Survey of the Natural Sciences, General Chemistry Which of the following conditions represents an increase in entropy? Freezing of water Condensation of steam Sublimation of dry ice Deposition of water vapor None 30. OAT: Survey of the Natural Sciences, General Chemistry The Nernst equation is used to calculate the electrode potential under non-standard conditions. Which factor does not appear in the Nernst equation? Gas constant (R) Temperature (T) Faraday's constant (F) Catalyst None 31. OAT: Survey of the Natural Sciences, General Chemistry Which element commonly forms an amphoteric oxide? Sodium Magnesium Aluminum Potassium None 32. OAT: Survey of the Natural Sciences, Organic Chemistry What is the product of the ozonolysis of 1-methylcyclohexene under reductive conditions? 1-methylcyclohexanol Methanol and cyclohexanone 1-methylcyclohexane 1-methylcyclohexanone and formaldehyde None 33. OAT: Survey of the Natural Sciences, Organic Chemistry Which functional group transformation is typically achieved using Wolff-Kishner reduction? Alcohol to ketone Alkene to alkane Ketone to alkane Carboxylic acid to aldehyde None 34. OAT: Survey of the Natural Sciences, Organic Chemistry What is the major organic product when 2-methylpropene reacts with water in the presence of sulfuric acid? 2-methylpropanol 2-methyl-2-propanol 2-methyl-1-propanol Methanol None 35. OAT: Survey of the Natural Sciences, Organic Chemistry Which reagent is most suitable for converting a primary alcohol to an aldehyde without further oxidation to a carboxylic acid? Chromic acid Pyridinium chlorochromate 'PCC' Potassium permanganate Hydrochloric acid None 36. OAT: Survey of the Natural Sciences, Organic Chemistry What is the expected outcome when cyclopentadiene reacts with maleic anhydride in a Diels-Alder reaction? A linear diene A bicyclic ketone A bicyclic anhydride A linear alcohol None 37. OAT: Survey of the Natural Sciences, Organic Chemistry Which technique is most commonly used to determine the structure of organic molecules through the analysis of molecular vibrations? Mass spectrometry Nuclear magnetic resonance (NMR) spectroscopy Infrared (IR) spectroscopy Ultraviolet-visible (UV-Vis) spectroscopy None 38. OAT: Survey of the Natural Sciences, Organic Chemistry In organic chemistry, which reaction mechanism describes the substitution reaction where the bond formation and bond breaking occur simultaneously? SN1 SN2 E1 E2 None 39. OAT: Survey of the Natural Sciences, Organic Chemistry Which statement best describes a reaction's mechanism involving a carbocation intermediate? It likely follows an SN1 reaction pathway. It proceeds via a direct bimolecular nucleophilic substitution. It is an example of a pericyclic reaction. It is catalyzed by strong bases. None 40. OAT: Survey of the Natural Sciences, Organic Chemistry In an aldol condensation, what is the role of the base? To protonate the carbonyl oxygen To deprotonate the alpha-carbon To facilitate nucleophilic attack on the carbonyl carbon To stabilize the leaving group None 41. OAT: Survey of the Natural Sciences, Organic Chemistry What is the major product of the Diels-Alder reaction between 1,3-butadiene and ethylene? 1,4-Hexadiene Cyclohexene Cyclobutane Cyclohexane None 42. OAT: Survey of the Natural Sciences, Organic Chemistry Which type of molecular orbitals are primarily involved in the bonding of benzene, according to molecular orbital theory? sp3 hybrid orbitals sp2 hybrid orbitals p orbitals d orbitals None 43. OAT: Survey of the Natural Sciences, Organic Chemistry What distinguishes a nucleophilic addition reaction in aldehydes and ketones from a nucleophilic substitution reaction? The use of a catalyst The formation of a new sigma bond The involvement of a carbonyl group The expulsion of a leaving group None 44. OAT: Survey of the Natural Sciences, Organic Chemistry What is the reactivity order of the following halides in an SN2 reaction? Methyl chloride > 1-chloropropane > 2-chloropropane > 2-chloro-2-methylpropane 2-chloro-2-methylpropane > 2-chloropropane > 1-chloropropane > Methyl chloride 1-chloropropane > Methyl chloride > 2-chloropropane > 2-chloro-2-methylpropane Methyl chloride > 1-chloropropane > 2-chloro-2-methylpropane > 2-chloropropane None 45. OAT: Survey of the Natural Sciences, Organic Chemistry In the presence of ultraviolet light, what type of reaction does chloroform undergo with alkenes? Addition Substitution Elimination Rearrangement None 46. OAT: Reading Comprehension After reading a complex passage about the history of public health, which statement best summarizes the main argument? Public health has consistently focused on prevention over treatment. The methods of public health have evolved due to technological advancements. Public health issues have become less significant over time. Public health has shifted its focus from global to local concerns. None 47. OAT: Reading Comprehension In a passage discussing climate change impacts on agriculture, what can be inferred about the author's perspective? The author believes technological innovation can solve all problems caused by climate change. The author is skeptical about the ability of science to predict climate change impacts accurately. The author thinks that adapting current agricultural practices is essential for future sustainability. The author feels that climate change is overstated by the scientific community. None 48. OAT: Reading Comprehension A detailed analysis of an article about renewable energy reveals multiple viewpoints. Which option best represents a synthesis of these viewpoints? Renewable energy is the only viable option for future energy needs. The debate over renewable energy is influenced by economic, environmental, and political factors. Non-renewable energy sources are more reliable than renewable sources. Political factors are the least influential in the debate on renewable energy. None 49. OAT: Reading Comprehension From a passage describing the effects of urbanization on wildlife, which conclusion is supported by the text? Urbanization has no significant effects on wildlife. Urbanization always leads to negative outcomes for wildlife. Some species adapt to urban environments, while others decline. All urban wildlife benefits from human activities. None 50. OAT: Reading Comprehension An article about the evolution of human language is complex and detailed. What is the central thesis of this article? Language evolved solely due to the need for social interaction. Language evolution is influenced by both biological and cultural factors. The evolution of language is a myth created by linguists. Cultural influences have no role in language evolution. None 51. OAT: Reading Comprehension In reviewing a technical passage on the mechanisms of photosynthesis, which statement accurately reflects a critical analysis? Photosynthesis is an inefficient process in plants. The passage provides a simplified explanation that may not cover all aspects of photosynthesis. Photosynthesis does not contribute significantly to reducing carbon dioxide levels. All scientific theories about photosynthesis are well-established and uncontroversial. None 52. OAT: Reading Comprehension When analyzing a passage on economic theories, what can be deduced about the author's viewpoint regarding market economies? The author supports a completely free market economy without any government intervention. The author believes that market economies are prone to cycles of boom and bust. The author suggests that market economies always fail. The author is neutral and presents multiple economic theories without bias. None 53. OAT: Reading Comprehension After reading a passage on ocean conservation, which action does the author most likely advocate for? Immediate cessation of all oceanic exploration Stricter regulations on marine pollution Complete ban on commercial fishing Encouragement of increased maritime traffic None 54. OAT: Reading Comprehension A passage details the societal impacts of the Internet. What conclusion can be drawn about the author's perspective on social media? The author views social media as an unmitigated good. The author believes social media has both positive and negative effects. The author thinks social media should be heavily censored. The author feels that social media has no real impact on society. None 55. OAT: Reading Comprehension In a discussion about the future of artificial intelligence in healthcare from a passage, which prediction is most aligned with the text? AI will replace all human doctors. AI will be used primarily in administrative tasks. AI will enhance diagnostic and treatment accuracy. AI will lead to the elimination of traditional medicine. None 56. OAT: Reading Comprehension From an article about global economic trends, which inference is most accurate about emerging markets? They will inevitably overtake established markets. They face significant challenges due to political instability. They offer no new opportunities for investment. They are unaffected by global economic conditions. None 57. OAT: Reading Comprehension A passage examines the role of genetics in mental health. What can be inferred about the author's view on the importance of environmental factors? Genetics are the only determinant of mental health. Environmental factors play no role in mental health. Both genetics and environment significantly influence mental health. The author dismisses the relevance of genetics in mental health. None 58. OAT: Reading Comprehension After reading a piece on renewable energy subsidies, which policy would the author most likely support? Phasing out all subsidies for renewable energy Increasing subsidies for fossil fuels Maintaining or increasing subsidies for renewable energy Removing all government interventions in energy markets None 59. OAT: Reading Comprehension In an article discussing the impacts of global warming on polar regions, what is the author's likely stance on international policy measures? The author supports immediate and aggressive international action. The author believes no international policy is needed. The author suggests that only national policies are effective. The author is skeptical about the impact of global warming. None 60. OAT: Reading Comprehension From a complex analysis of historical economic downturns, which theme is most prevalent in the text? Economic downturns are unpredictable and random. Downturns have little impact on long-term economic growth. Economic downturns are part of cyclical patterns influenced by various factors. All economic downturns can be prevented with appropriate regulation. None 61. OAT: Reading Comprehension A passage on the evolution of digital communication technologies suggests which of the following about future trends? Digital communication will soon become obsolete. Future technologies will eliminate face-to-face communication. Innovations in digital communication will continue to shape social interactions. Traditional communication methods are preferred over digital options. None 62. OAT: Reading Comprehension In a detailed review of a book about the history of urban development, which assertion is most supported by the author? Urban development has had universally negative effects on society. Urban development is crucial for economic and social progression. There is no significant benefit to urban development. Urban development should be halted to preserve rural areas. None 63. OAT: Reading Comprehension Analyzing a passage on the role of art in society, what does the author imply about contemporary art? It is disconnected from societal values. It reflects and critiques current societal issues. It has no real impact on society. It should return to classical themes to be meaningful. None 64. OAT: Reading Comprehension From a discussion on dietary trends and health, which conclusion can be drawn about the author's view on processed foods? They are essential for a balanced diet. They pose no health risks. They should be avoided for optimal health. They are more nutritious than organic foods. None 65. OAT: Reading Comprehension After reading an article on the future of transportation, which prediction does the author most likely agree with? Autonomous vehicles will dominate all forms of transportation. Public transportation systems will soon become obsolete. Transportation innovations will lead to more sustainable urban environments. There will be a decline in transportation technology advancements. None 66. OAT: Reading Comprehension In a passage about the psychological effects of social media, which of the following statements would the author most likely support? Social media has no significant psychological effects. Social media primarily causes negative psychological effects. The impact of social media on psychology is overwhelmingly positive. Social media has complex psychological effects that can be both positive and negative. None 67. OAT: Physics A light ray strikes a reflective surface at an angle of incidence of 45 degrees. What is the angle of reflection? 45 degrees 90 degrees 135 degrees 180 degrees None 68. OAT: Physics A 5 kg object moving with a velocity of 10 m/s collides elastically with a stationary 3 kg object. What is the velocity of the 5 kg object immediately after the collision? 2 m/s 4 m/s 6 m/s 8 m/s None 69. OAT: Physics A car traveling at 20 m/s applies the brakes and stops in 5 seconds. What is the car's acceleration? -4 m/s\(^2\) -20 m/s\(^2\) 4 m/s\(^2\) 20 m/s\(^2\) None 70. OAT: Physics Two waves traveling along the same medium interfere to produce a resultant wave. If the amplitude of the first wave is 3 units and the amplitude of the second wave is 4 units, what could be the maximum possible amplitude of the resultant wave? 1 unit 5 units 7 units 12 units None 71. OAT: Physics A pendulum makes 40 complete oscillations in 60 seconds. What is its frequency? 0.67 Hz 1.5 Hz 2.0 Hz 4.0 Hz None 72. OAT: Physics A transformer has 1000 turns in its primary coil and 100 turns in its secondary coil. If the primary voltage is 120 V, what is the secondary voltage? 12 V 24 V 120 V 240 V None 73. OAT: Physics Light passes from air into water, which has a refractive index of 1.33. If the angle of incidence in air is 30 degrees, what is the angle of refraction in water? 19.47 degrees 22.5 degrees 25.76 degrees 28.07 degrees None 74. OAT: Physics An object is placed 10 cm from a concave mirror with a focal length of 5 cm. What is the nature of the image formed? Real and inverted Real and upright Virtual and inverted Virtual and upright None 75. OAT: Physics A resistor of 8 ohms and a capacitor with a capacitance of 500 microfarads are connected in series across a 50 Hz AC source. What is the impedance of the circuit? 8 ohms 10 ohms 12 ohms 16 ohms None 76. OAT: Physics A block slides down a frictionless incline plane of 30 degrees angle. What is the acceleration of the block? \( g \sin 30^\circ \) \( g \cos 30^\circ \) \( g \tan 30^\circ \) \( g \) None 77. OAT: Physics What is the wavelength of a sound wave traveling at 340 m/s with a frequency of 850 Hz? 0.25 m 0.4 m 0.5 m 0.75 m None 78. OAT: Physics A light beam travels from glass (\( n = 1.5 \)) to air (\( n = 1.0 \)). If the angle of incidence in the glass is 45 degrees, what is the angle of refraction in the air? 48.59 degrees 51.06 degrees 66.42 degrees 70.53 degrees None 79. OAT: Physics A circuit contains a 10 V battery and two resistors (6 ohms and 3 ohms) in parallel. What is the total current flowing through the circuit? 0.5 A 1.0 A 2.0 A 3.33 A None 80. OAT: Physics A gas expands and does 50 J of work on its surroundings while absorbing 70 J of heat. What is the change in internal energy of the gas? 20 J 50 J 70 J 120 J None 81. OAT: Physics A laser emits light with a frequency of \( 5 \times 10^{14} \) Hz. What is the energy of one photon of this light? (Planck's constant \( h = 6.626 \times 10^{-34} \) Js) \( 3.313 \times 10^{-19} \) J \( 3.313 \times 10^{-18} \) J \( 3.313 \times 10^{-20} \) J \( 3.313 \times 10^{-21} \) J None 82. OAT: Physics A 100 Hz sound wave travels through air at a speed of 340 m/s. What is its wavelength? 0.34 m 3.4 m 34 m 340 m None 83. OAT: Physics A parallel-plate capacitor is charged to a potential difference of 100 V and stores a charge of 0.01 C. What is the capacitance of the capacitor? 0.1 F 0.01 F 0.001 F 0.0001 F None 84. OAT: Quantitative Reasoning If the ratio of the radius of two circles is 1:3, what is the ratio of their areas? 1:03 1:09 3:01 9:01 None 85. OAT: Quantitative Reasoning A train travels 160 miles in 2 hours and 40 minutes. What is the average speed of the train in miles per hour? 60 mph 50 mph 65 mph 70 mph None 86. OAT: Quantitative Reasoning What is the sum of the infinite geometric series where the first term is 12 and the common ratio is 1/3? 18 20 24 36 None 87. OAT: Quantitative Reasoning If \(f(x) = x^2 + 2x - 3\) and \(g(x) = 2x - 1\), what is \(f(g(2))\)? 7 11 15 19 None 88. OAT: Quantitative Reasoning A bag contains 4 red, 3 blue, and 5 green marbles. If three marbles are drawn at random, what is the probability that they are all green? 22-Jan Jan-33 Jan-44 Jan-55 None 89. OAT: Quantitative Reasoning If \(x\) and \(y\) are integers such that \(4x - 3y = 5\), which of the following could be the value of \(3x - 4y\)? -1 1 5 9 None 90. OAT: Quantitative Reasoning A right triangle has sides 3 cm, 4 cm, and 5 cm. If the shortest side is doubled, what is the new area of the triangle? 6 cm^2 12 cm^2 24 cm^2 30 cm^2 None 91. OAT: Quantitative Reasoning What is the 7th term in the arithmetic sequence where the first term is 3 and the common difference is 5? 33 35 38 40 None 92. OAT: Quantitative Reasoning The volume of a cylinder is given by the formula \(V = \pi r^2 h\). If the radius is halved and the height is doubled, what is the effect on the volume of the cylinder? It remains the same. It is halved. It is doubled. It is quadrupled. None 93. OAT: Quantitative Reasoning A rectangle has a length that is twice its width. If the area of the rectangle is 288 square meters, what is its perimeter? 24 m 48 m 68 m 72 m None 94. OAT: Quantitative Reasoning What is the sum of the roots of the quadratic equation \(x^2 - 5x + 6 = 0\)? 1 5 6 11 None 95. OAT: Quantitative Reasoning How many different four-letter sequences can be formed from the letters A, B, C, D, and E if no letter may be used more than once? 120 360 24 625 None 96. OAT: Quantitative Reasoning If a cube's surface area is 150 square centimeters, what is the length of one side of the cube? 5 cm 7.5 cm 12.5 cm 25 cm None 97. OAT: Quantitative Reasoning In a certain sequence, the third term is 9 and each subsequent term is the sum of all previous terms. What is the fifth term? 37 76 65 28 None 98. OAT: Quantitative Reasoning What is the median of the data set \(3, 7, 9, 12, 14, 16, 18\)? 12 14 9 16 None 99. OAT: Quantitative Reasoning If a triangle has angles in the ratio 2:3:4, what is the measure of the largest angle? 60 degrees 72 degrees 80 degrees 90 degrees None 100. OAT: Quantitative Reasoning A circle is inscribed in a square. If the area of the square is 64 square units, what is the area of the circle? 16\pi 32\pi 48\pi 64\pi None 1 out of 100 Time is Up! Time's up
