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OAT Cheat Sheet 2026

The 30 highest-yield OAT facts, distilled from real exam questions. Print it, save it as a PDF, or study it here โ€” free, no sign-up.

230 questions
235 min time limit
70.00% to pass
  1. Which of the assertions regarding trypsin is untrue? โ†’ It is operative over a wide pH range
  2. Which of the following correctly ranks the given types of electromagnetic radiation from longest wavelength to shortest wavelength? โ†’ Radio waves, Infrared, Visible light, X-rays
  3. In the process of eutrophication, what is the direct cause of the depletion of dissolved oxygen in the water, leading to the creation of a 'dead zone'? โ†’ The decomposition of dead algae by aerobic bacteria.
  4. The reaction of (2E,4E)-hexa-2,4-diene with maleic anhydride is a classic example of which type of reaction? โ†’ Diels-Alder Cycloaddition
  5. Which of the following is NOT a feature of animal asexual reproduction? โ†’ The daughter cells fuse to form a zygote
  6. During reproduction, which of the following occurs โ†’ Ovulation
  7. A diploid organism has 2n = 8 chromosomes. How many chromosomes would be present in each daughter cell following meiosis II? โ†’ 4
  8. Which of the following best describes the law of independent assortment? โ†’ Genes on different chromosomes are inherited independently of one another
  9. Which of the following is an example of codominance? โ†’ AB blood type in humans expressing both A and B antigens
  10. Which of the following is a primary function of Luteinizing Hormone (LH) in males? โ†’ Stimulation of Leydig cells to produce testosterone
  11. Which of the following expressions is equivalent to (2xยณyโปยฒ)ยฒ / (4xโปยนy) ? โ†’ xโท / yโต
  12. Which of the following events is a key distinguishing feature of Meiosis I when compared to Mitosis? โ†’ Synapsis of homologous chromosomes
  13. A retail item originally priced at $80 is put on sale for $68. What is the percent decrease in the price of the item? โ†’ 15%
  14. Which of the following sets of quantum numbers (n, l, m_l, m_s) is NOT permissible for an electron in an atom? โ†’ (4, 3, -4, +1/2)
  15. Which of the following in cells may catalyze hydrogen peroxide processes, provide cellular energy, and create proteins in that order? โ†’ Peroxisomes, mitochondria, and ribosomes
  16. In a dihybrid cross between two AaBb parents, what is the expected ratio of offspring showing both dominant phenotypes (A_B_)? โ†’ 9/16
  17. The energy that electrons give up as they go through the electron transport chain is used to โ†’ Product ATP
  18. All enzymes in the synaptic cleft are shown to be denatured by a chemical agent. How will this agent affect acetylcholine? โ†’ Acetylcholine will not be degraded in the synaptic cleft
  19. A change in the membrane potential of a neuron from +50 to -70 millivolts is considered โ†’ Repolarization
  20. Which of the following statements about organisms that are the first to establish an ecologically successional habitat is correct? โ†’ They change the habitat in a way that makes it more habitable for other organisms
  21. Which of the following conditions is NOT an assumption for a population to be in Hardy-Weinberg equilibrium? โ†’ Small population size
  22. According to Darwin's theory of natural selection, which individuals are most likely to contribute offspring to the next generation? โ†’ Individuals with traits best suited to their environment
  23. What is the correct IUPAC name for the following molecule? โ†’ 4-hydroxy-5-methylhexan-2-one
  24. A circle is inscribed within a square that has a side length of 10 cm. What is the area of the region that is inside the square but outside the circle? โ†’ 100 - 25ฯ€ cmยฒ
  25. Which process generates the greatest genetic diversity during sexual reproduction? โ†’ Independent assortment and crossing over during meiosis
  26. During the titration of 25.0 mL of 0.100 M HCl with 0.100 M NaOH, what is the pH of the solution at the equivalence point at 25ยฐC? โ†’ 7.00
  27. During the process of transcription in a eukaryotic cell, which enzyme is responsible for synthesizing a pre-mRNA molecule by reading the DNA template strand? โ†’ RNA Polymerase II
  28. In the context of quantum mechanics, which quantum number is the primary determinant of the shape of an atomic orbital (e.g., s, p, d, f)? โ†’ Azimuthal quantum number (l)
  29. How many signals would be expected in the ยนH NMR spectrum of 2,3-dimethyl-2-butene? โ†’ 2
  30. Which of the following best describes epistasis? โ†’ One gene's alleles masking or modifying the expression of a different gene
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