ATI TEAS Science Practice Test

ATI TEAS Science Practice Test gives you a large set of four-choice science questions in a fast “answer, then check” format for 2026 prep. Use it to drill anatomy & physiology basics, biology, chemistry, scientific reasoning, and data interpretation, then open “Show Answer” to confirm the rule and learn the pattern behind the distractors. It’s built for repeated passes so weak concepts show up quickly and improve with retakes.

FAQ

What’s the best way to practice TEAS science questions?

Work in short, timed bursts (10–20 questions), then immediately review explanations for every miss. For science, focus on why the right choice is correct (function, mechanism, or relationship) and write a one-line “rule” you can reuse on a new question later.

Can I use a TEAS science practice test PDF instead of online questions?

A PDF can help with convenience, but you still need an active review loop. If you use a printable set, add structure: mark uncertainty, check answers right away, and redo only the missed concepts after a short break so you’re practicing recall—not just recognition.

How many science questions are on the TEAS?

The science section is a fixed portion of the overall exam, and it’s large enough that you’ll see multiple angles on the same core topics. Train as if the next question will rephrase the same concept—especially A&P processes, basic chemistry, and interpreting tables/graphs.

What science topics should I expect on the TEAS?

Expect a heavy tilt toward anatomy & physiology (systems, homeostasis, basic function), plus biology fundamentals, introductory chemistry, and scientific reasoning. The skill that sneaks up on people is reading information from charts or short passages and applying a simple rule correctly.

Are TEAS practice tests harder than the real exam?

Some sets feel harder because they pack in trickier distractors or mix topics aggressively. That’s not a problem if you use it correctly: treat misses as a map of which concepts you can’t explain in plain language yet, then retest until you can answer the same idea in new wording.

Free ATI TEAS Science Practice Test

Q1. Which change directly causes the semilunar valves to close?
Q2. Which immune cell type is primarily responsible for producing antibodies?
Q3. Gas exchange in the lungs occurs primarily across which structure?
Q4. Balance the equation: __ H₂ + __ O₂ → __ H₂O. What coefficient is needed in front of O₂?
Q5. In an experiment on reaction rate, a student changes temperature while keeping concentration constant. What is the independent variable?
Q6. A toxin blocks acetylcholine receptors at the neuromuscular junction. Which immediate effect is most likely?
Q7. If nicotinic acetylcholine receptors on skeletal muscle are blocked, which outcome is expected?
Q8. Most chemical digestion of proteins begins in which organ?
Q9. Which organelle is most directly responsible for increasing ATP production through aerobic respiration?
Q10. A sudden decline in herbivores occurs in an ecosystem. Which group is most immediately affected by reduced food availability?
Q11. A solution has [H⁺] = 6.3 × 10^-5 M. What is the pH? (Round to the nearest tenth.)
Q12. Which process during meiosis most directly increases genetic variation by exchanging DNA between homologous chromosomes?
Q13. What is the molarity of a solution made by dissolving 0.75 mol of solute in 0.5 L of solution?
Q14. Antibodies are produced by which cells after activation?
Q15. Why does increasing substrate concentration eventually stop increasing the rate of an enzyme-catalyzed reaction?
Q16. Oxygen and carbon dioxide diffuse between air and blood across which structure?
Q17. What is the molarity of a solution made by dissolving 0.75 mol of solute in 1 L of solution?
Q18. A point mutation changes a codon but does not change the amino acid encoded. What is this mutation called?
Q19. What is the molarity of a solution made by dissolving 0.25 mol of solute in 1.5 L of solution?
Q20. An enzyme-catalyzed reaction speeds up when more substrate is added, but then levels off. Why does the rate level off?
Q21. What event in meiosis creates new allele combinations by swapping segments between homologous chromosomes?
Q22. A student tests whether fertilizer affects plant height. Fertilizer amount is changed while light and water are kept constant. What is the independent variable?
Q23. Which trend generally increases from left to right across a period on the periodic table?
Q24. What is the molarity of a solution made by dissolving 1.2 mol of solute in 1 L of solution?
Q25. If a primary consumer population decreases sharply, which trophic level is most directly affected first?
Q26. Which hormone most directly increases blood glucose during fasting?
Q27. Moving left to right across a period, which property generally increases?
Q28. A person loses fluid through sweating without replacing water. Which physiological response most directly conserves water?
Q29. A solution has [H⁺] = 3.2 × 10^-5 M. What is the pH? (Round to the nearest tenth.)
Q30. Which event occurs immediately after ventricular systole ends?
Q31. A DNA base substitution alters a codon, yet the protein sequence is unchanged. Which term best describes the mutation?
Q32. A eukaryotic cell increases ATP demand. Which change would most directly increase ATP production?
Q33. What is the molarity of a solution made by dissolving 0.4 mol of solute in 2 L of solution?
Q34. Where does protein digestion begin due to the action of pepsin?
Q35. What is the molarity of a solution made by dissolving 1.2 mol of solute in 0.5 L of solution?
Q36. What is the molarity of a solution made by dissolving 0.75 mol of solute in 1.5 L of solution?
Q37. A solution has [H⁺] = 3.2 × 10^-3 M. What is the pH? (Round to the nearest tenth.)
Q38. What is the molarity of a solution made by dissolving 1.2 mol of solute in 1.5 L of solution?
Q39. During fasting between meals, which hormone acts to raise blood glucose levels?
Q40. What is the molarity of a solution made by dissolving 0.4 mol of solute in 0.5 L of solution?
Q41. During dehydration, which hormone-driven kidney response most directly reduces water loss?
Q42. What is the molarity of a solution made by dissolving 0.25 mol of solute in 0.5 L of solution?
Q43. In the cardiac cycle, what triggers closure of the aortic and pulmonary valves?
Q44. A solution has [H⁺] = 2.5 × 10^-3 M. What is the pH? (Round to the nearest tenth.)
Q45. A solution has [H⁺] = 3.2 × 10^-4 M. What is the pH? (Round to the nearest tenth.)
Q46. What is the molarity of a solution made by dissolving 0.4 mol of solute in 1.5 L of solution?
Q47. A dehydrated patient has increased plasma osmolality. Which change most directly helps restore normal osmolality?
Q48. A solution has [H⁺] = 2.5 × 10^-5 M. What is the pH? (Round to the nearest tenth.)
Q49. A solution has [H⁺] = 6.3 × 10^-4 M. What is the pH? (Round to the nearest tenth.)
Q50. A solution has [H⁺] = 3.2 × 10^-6 M. What is the pH? (Round to the nearest tenth.)
Q51. A solution has [H⁺] = 1 × 10^-4 M. What is the pH? (Round to the nearest tenth.)
Q52. A solution has [H⁺] = 6.3 × 10^-6 M. What is the pH? (Round to the nearest tenth.)
Q53. A solution has [H⁺] = 2.5 × 10^-4 M. What is the pH? (Round to the nearest tenth.)
Q54. A solution has [H⁺] = 6.3 × 10^-3 M. What is the pH? (Round to the nearest tenth.)
Q55. What is the molarity of a solution made by dissolving 0.25 mol of solute in 2 L of solution?
Q56. A solution has [H⁺] = 1 × 10^-3 M. What is the pH? (Round to the nearest tenth.)
Q57. What is the molarity of a solution made by dissolving 0.4 mol of solute in 1 L of solution?
Q58. A solution has [H⁺] = 2.5 × 10^-6 M. What is the pH? (Round to the nearest tenth.)
Q59. What is the molarity of a solution made by dissolving 0.75 mol of solute in 2 L of solution?
Q60. What is the molarity of a solution made by dissolving 1.2 mol of solute in 2 L of solution?
Q61. A solution has [H⁺] = 1 × 10^-5 M. What is the pH? (Round to the nearest tenth.)
Q62. A solution has [H⁺] = 1 × 10^-6 M. What is the pH? (Round to the nearest tenth.)
Q63. What is the molarity of a solution made by dissolving 0.25 mol of solute in 1 L of solution?
Q101. During metabolic acidosis, which breathing change helps compensate?
Q102. A drop in blood pressure reduces renal perfusion. Which cascade most directly increases sodium (and water) reabsorption to raise blood pressure?
Q103. During which phase of mitosis do sister chromatids separate and move to opposite poles?
Q104. When blood pressure falls, which mechanism most directly promotes sodium retention to help restore blood volume?
Q105. Which enzyme most directly synthesizes new DNA strands during replication?
Q106. Why are antibiotics generally ineffective against viruses?
Q107. In mitosis, when do sister chromatids get pulled apart toward opposite ends of the cell?
Q108. Which statement best describes a Brønsted–Lowry acid?
Q109. Which defense is considered an innate immune response?
Q110. A population of bacteria doubles every 20 minutes. If it starts with 500 cells, how many cells will there be after 60 minutes?
Q111. A line graph shows bacterial growth increasing rapidly, then leveling off. What is the most likely reason growth levels off?
Q112. In skeletal muscle contraction, what directly exposes binding sites on actin for myosin?
Q113. In Brønsted–Lowry theory, an acid is defined as what?
Q114. Which reason best explains why antibiotics do not treat viral infections?
Q115. A reaction occurs in a sealed container. If the total mass of reactants is 85 g, what is the total mass of products?
Q116. Which function is performed by chlorophyll during the light-dependent reactions?
Q117. Most carbon dioxide in blood is transported in which form?
Q118. Electron transfer between two atoms most directly produces which type of bond?
Q119. A 1 M solution is diluted by taking 100 mL and adding water to make 300 mL total. What is the new molarity?
Q120. A 1.5 M solution is diluted by taking 150 mL and adding water to make 250 mL total. What is the new molarity?
Q121. A 2 M solution is diluted by taking 100 mL and adding water to make 300 mL total. What is the new molarity?
Q122. In a closed system, 12 g of reactants produce products. What total mass of products should be expected?
Q123. A culture doubles every 15 minutes. Starting with 200 cells, how many cells after 45 minutes?
Q124. During DNA replication, which enzyme adds nucleotides to build the new strand?
Q125. A graph of enzyme activity vs. temperature rises to a peak and then falls sharply. What is the best explanation for the sharp decline after the peak?
Q126. A cell needs to move Na⁺ from low concentration to high concentration across the membrane. Which transport is required?
Q127. Which response is part of innate (nonspecific) immunity?
Q128. A 1 M solution is diluted by taking 250 mL and adding water to make 300 mL total. What is the new molarity?
Q129. A 1.5 M solution is diluted by taking 200 mL and adding water to make 500 mL total. What is the new molarity?
Q130. If blood pH drops (acidosis), which respiratory change most directly helps raise pH back toward normal?
Q131. A 1 M solution is diluted by taking 250 mL and adding water to make 400 mL total. What is the new molarity?
Q132. In photosynthesis, what is the primary role of chlorophyll in the light reactions?
Q133. A 1 M solution is diluted by taking 250 mL and adding water to make 500 mL total. What is the new molarity?
Q134. Which type of bond forms when electrons are transferred from a metal to a nonmetal?
Q135. Moving glucose into a cell against its concentration gradient requires which process?
Q136. Which event permits myosin heads to bind to actin during contraction?
Q137. A 1.5 M solution is diluted by taking 100 mL and adding water to make 400 mL total. What is the new molarity?
Q138. A 1 M solution is diluted by taking 150 mL and adding water to make 400 mL total. What is the new molarity?
Q139. A 1.5 M solution is diluted by taking 100 mL and adding water to make 500 mL total. What is the new molarity?
Q140. A 0.5 M solution is diluted by taking 100 mL and adding water to make 300 mL total. What is the new molarity?
Q141. A 1.5 M solution is diluted by taking 200 mL and adding water to make 400 mL total. What is the new molarity?
Q142. A 0.5 M solution is diluted by taking 150 mL and adding water to make 300 mL total. What is the new molarity?
Q143. A 1.5 M solution is diluted by taking 250 mL and adding water to make 300 mL total. What is the new molarity?
Q144. A 1.5 M solution is diluted by taking 200 mL and adding water to make 250 mL total. What is the new molarity?
Q145. A 1 M solution is diluted by taking 200 mL and adding water to make 500 mL total. What is the new molarity?
Q146. Which blood component primarily transports carbon dioxide from tissues to lungs?
Q147. A 1.5 M solution is diluted by taking 200 mL and adding water to make 300 mL total. What is the new molarity?
Q148. A 1 M solution is diluted by taking 200 mL and adding water to make 300 mL total. What is the new molarity?
Q149. A 2 M solution is diluted by taking 250 mL and adding water to make 300 mL total. What is the new molarity?
Q150. A 0.5 M solution is diluted by taking 200 mL and adding water to make 400 mL total. What is the new molarity?
Q151. A 0.5 M solution is diluted by taking 250 mL and adding water to make 500 mL total. What is the new molarity?
Q152. A 0.5 M solution is diluted by taking 100 mL and adding water to make 250 mL total. What is the new molarity?
Q153. A 0.5 M solution is diluted by taking 200 mL and adding water to make 300 mL total. What is the new molarity?
Q154. A 0.5 M solution is diluted by taking 150 mL and adding water to make 250 mL total. What is the new molarity?
Q155. A 1.5 M solution is diluted by taking 100 mL and adding water to make 250 mL total. What is the new molarity?
Q156. A 1.5 M solution is diluted by taking 100 mL and adding water to make 300 mL total. What is the new molarity?
Q157. A 1 M solution is diluted by taking 150 mL and adding water to make 300 mL total. What is the new molarity?
Q158. A 0.5 M solution is diluted by taking 100 mL and adding water to make 500 mL total. What is the new molarity?
Q159. A 2 M solution is diluted by taking 150 mL and adding water to make 300 mL total. What is the new molarity?
Q160. A 2 M solution is diluted by taking 250 mL and adding water to make 500 mL total. What is the new molarity?
Q161. A 0.5 M solution is diluted by taking 150 mL and adding water to make 500 mL total. What is the new molarity?
Q162. A 0.5 M solution is diluted by taking 250 mL and adding water to make 400 mL total. What is the new molarity?
Q163. A 2 M solution is diluted by taking 200 mL and adding water to make 300 mL total. What is the new molarity?
Q164. A 1 M solution is diluted by taking 100 mL and adding water to make 250 mL total. What is the new molarity?
Q165. A 2 M solution is diluted by taking 200 mL and adding water to make 500 mL total. What is the new molarity?
Q166. A 2 M solution is diluted by taking 250 mL and adding water to make 250 mL total. What is the new molarity?
Q167. A 2 M solution is diluted by taking 200 mL and adding water to make 400 mL total. What is the new molarity?
Q168. A 0.5 M solution is diluted by taking 250 mL and adding water to make 250 mL total. What is the new molarity?
Q169. A 0.5 M solution is diluted by taking 250 mL and adding water to make 300 mL total. What is the new molarity?
Q170. A 1.5 M solution is diluted by taking 250 mL and adding water to make 500 mL total. What is the new molarity?
Q171. A 0.5 M solution is diluted by taking 100 mL and adding water to make 400 mL total. What is the new molarity?
Q172. A 1.5 M solution is diluted by taking 150 mL and adding water to make 300 mL total. What is the new molarity?
Q173. A 1.5 M solution is diluted by taking 150 mL and adding water to make 500 mL total. What is the new molarity?
Q174. A 1 M solution is diluted by taking 100 mL and adding water to make 500 mL total. What is the new molarity?
Q175. A 2 M solution is diluted by taking 150 mL and adding water to make 400 mL total. What is the new molarity?
Q176. A 1.5 M solution is diluted by taking 250 mL and adding water to make 250 mL total. What is the new molarity?
Q177. A 1 M solution is diluted by taking 150 mL and adding water to make 250 mL total. What is the new molarity?
Q178. A 1 M solution is diluted by taking 250 mL and adding water to make 250 mL total. What is the new molarity?
Q179. A 2 M solution is diluted by taking 250 mL and adding water to make 400 mL total. What is the new molarity?
Q180. A 2 M solution is diluted by taking 200 mL and adding water to make 250 mL total. What is the new molarity?
Q181. A 1 M solution is diluted by taking 100 mL and adding water to make 400 mL total. What is the new molarity?
Q182. A 2 M solution is diluted by taking 100 mL and adding water to make 500 mL total. What is the new molarity?
Q183. A 2 M solution is diluted by taking 100 mL and adding water to make 250 mL total. What is the new molarity?
Q184. A 0.5 M solution is diluted by taking 150 mL and adding water to make 400 mL total. What is the new molarity?
Q185. A 1 M solution is diluted by taking 200 mL and adding water to make 250 mL total. What is the new molarity?
Q186. A 1.5 M solution is diluted by taking 250 mL and adding water to make 400 mL total. What is the new molarity?
Q187. A 1.5 M solution is diluted by taking 150 mL and adding water to make 400 mL total. What is the new molarity?
Q188. A 0.5 M solution is diluted by taking 200 mL and adding water to make 500 mL total. What is the new molarity?
Q189. A 0.5 M solution is diluted by taking 200 mL and adding water to make 250 mL total. What is the new molarity?
Q190. A 1 M solution is diluted by taking 150 mL and adding water to make 500 mL total. What is the new molarity?
Q191. A 2 M solution is diluted by taking 150 mL and adding water to make 500 mL total. What is the new molarity?
Q192. A 1 M solution is diluted by taking 200 mL and adding water to make 400 mL total. What is the new molarity?
Q193. A 2 M solution is diluted by taking 100 mL and adding water to make 400 mL total. What is the new molarity?
Q194. A 2 M solution is diluted by taking 150 mL and adding water to make 250 mL total. What is the new molarity?
Q201. A cell with damaged DNA is prevented from entering S phase. Which type of control is responsible?
Q202. An infectious agent made of nucleic acid inside a protein capsid that must use host machinery is a what?
Q203. In a redox reaction, oxidation is best defined as what?
Q204. Vaccination mainly improves future protection by promoting what?
Q205. A researcher tests a new disinfectant on bacterial growth. Which group is the control group?
Q206. A solution volume is recorded as 0.75 L. Which equivalent value is correct?
Q207. A lab report lists a beaker volume as 250 mL. Which statement best interprets this measurement?
Q208. A heritable trait that improves survival becomes more frequent in a population over time. This is an example of what?
Q209. In a population, individuals with a trait survive and reproduce more than others. Over generations, the trait becomes more common. What process is described?
Q210. What action most directly reduces the spread of pathogens transmitted by hands?
Q211. Which mechanism most directly prevents replication of damaged DNA during the cell cycle?
Q212. Binding of a ligand to a membrane receptor that activates internal pathways is best described as what?
Q213. When body temperature is too high, which physiological change helps cool the body?
Q214. Why can a vaccinated person often respond faster to a later exposure to the same pathogen?
Q215. A positively charged particle located in an atom’s nucleus is a what?
Q216. A gas has pressure 2 atm at volume 2 L (constant temperature). What is the pressure when volume is 1 L?
Q217. In an experiment testing a new drug, which group serves as the control?
Q218. A patient’s core temperature rises. Which response most directly increases heat loss?
Q219. A gas has pressure 1 atm at volume 4 L (constant temperature). What is the pressure when volume is 1.5 L?
Q220. Which statement correctly defines oxidation in redox chemistry?
Q221. A gas has pressure 1.5 atm at volume 4 L (constant temperature). What is the pressure when volume is 1 L?
Q222. A gas has pressure 1.2 atm at volume 3 L (constant temperature). What is the pressure when volume is 2 L?
Q223. A hormone binds to a receptor on the cell membrane and triggers a response inside the cell. This is an example of what?
Q224. Which pathogen type consists of genetic material enclosed in a protein coat and requires a host cell to replicate?
Q225. A gas has pressure 2 atm at volume 3 L (constant temperature). What is the pressure when volume is 1.5 L?
Q226. Which subatomic particle has a positive charge and is found in the nucleus?
Q227. A gas has pressure 2 atm at volume 4 L (constant temperature). What is the pressure when volume is 1.5 L?
Q228. The amount of air inhaled or exhaled during normal breathing is called what?
Q229. A gas has pressure 2 atm at volume 4 L (constant temperature). What is the pressure when volume is 2 L?
Q230. Most nutrient absorption occurs in which part of the digestive tract?
Q231. A gas has pressure 1 atm at volume 3 L (constant temperature). What is the pressure when volume is 1.5 L?
Q232. Which term describes the volume of air moved in or out during a normal quiet breath?
Q233. Where does the majority of digestion and absorption of nutrients occur?
Q234. Which practice most directly reduces transmission of many respiratory infections?
Q235. A gas has pressure 1.2 atm at volume 4 L (constant temperature). What is the pressure when volume is 1 L?
Q236. A gas has pressure 2 atm at volume 2 L (constant temperature). What is the pressure when volume is 2 L?
Q237. A gas has pressure 1.5 atm at volume 3 L (constant temperature). What is the pressure when volume is 1.5 L?
Q238. A gas has pressure 1.5 atm at volume 4 L (constant temperature). What is the pressure when volume is 1.5 L?
Q239. A gas has pressure 1.2 atm at volume 2 L (constant temperature). What is the pressure when volume is 2 L?
Q240. A gas has pressure 1 atm at volume 4 L (constant temperature). What is the pressure when volume is 2 L?
Q241. A gas has pressure 1 atm at volume 3 L (constant temperature). What is the pressure when volume is 1 L?
Q242. A gas has pressure 1.2 atm at volume 4 L (constant temperature). What is the pressure when volume is 1.5 L?
Q243. A gas has pressure 1.2 atm at volume 3 L (constant temperature). What is the pressure when volume is 1 L?
Q244. A gas has pressure 1.5 atm at volume 3 L (constant temperature). What is the pressure when volume is 1 L?
Q245. A gas has pressure 1 atm at volume 4 L (constant temperature). What is the pressure when volume is 1 L?
Q246. A gas has pressure 1.5 atm at volume 4 L (constant temperature). What is the pressure when volume is 2 L?
Q247. A gas has pressure 1 atm at volume 3 L (constant temperature). What is the pressure when volume is 2 L?
Q248. A gas has pressure 1 atm at volume 2 L (constant temperature). What is the pressure when volume is 1.5 L?
Q249. A gas has pressure 1 atm at volume 2 L (constant temperature). What is the pressure when volume is 2 L?
Q250. A gas has pressure 1.5 atm at volume 2 L (constant temperature). What is the pressure when volume is 2 L?
Q251. A gas has pressure 2 atm at volume 4 L (constant temperature). What is the pressure when volume is 1 L?
Q252. A gas has pressure 1.5 atm at volume 2 L (constant temperature). What is the pressure when volume is 1.5 L?
Q253. A gas has pressure 2 atm at volume 3 L (constant temperature). What is the pressure when volume is 1 L?
Q254. A gas has pressure 2 atm at volume 3 L (constant temperature). What is the pressure when volume is 2 L?
Q255. A gas has pressure 2 atm at volume 2 L (constant temperature). What is the pressure when volume is 1.5 L?
Q256. A gas has pressure 1.2 atm at volume 4 L (constant temperature). What is the pressure when volume is 2 L?
Q257. A gas has pressure 1 atm at volume 2 L (constant temperature). What is the pressure when volume is 1 L?
Q258. A gas has pressure 1.2 atm at volume 2 L (constant temperature). What is the pressure when volume is 1.5 L?
Q259. A gas has pressure 1.2 atm at volume 2 L (constant temperature). What is the pressure when volume is 1 L?
Q260. A gas has pressure 1.5 atm at volume 2 L (constant temperature). What is the pressure when volume is 1 L?
Q261. A gas has pressure 1.2 atm at volume 3 L (constant temperature). What is the pressure when volume is 1.5 L?
Q262. A gas has pressure 1.5 atm at volume 3 L (constant temperature). What is the pressure when volume is 2 L?
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