The Science section is often considered the most challenging part of the TEAS exam for many nursing school applicants. Unlike the Reading or English sections, the Science portion requires students to recall and apply knowledge from multiple scientific disciplines, including anatomy and physiology, biology, chemistry, and scientific reasoning.
A strong performance in the Science section can significantly improve your overall TEAS score and strengthen your nursing school application. Since nursing programs rely heavily on scientific concepts, admissions committees pay close attention to how well applicants perform in this area.
The good news is that success on the TEAS Science section is achievable with the right preparation strategy. This guide covers everything you need to know, including the exam format, key topics, study techniques, and practical tips to help you maximize your score.
Understanding the TEAS Science Section
The TEAS Science section is designed to assess students’ foundational scientific knowledge necessary for success in nursing and allied health programs.
The TEAS Science section is widely regarded as the most challenging part of the exam. It tests a broad range of knowledge across the life sciences, human anatomy, chemistry, and scientific reasoning, all under tight time pressure. The good news: unlike cramming for a random trivia contest, the TEAS tests a well-defined and predictable set of concepts. If you study the right things in the right way, a score in the Advanced or Exemplary range is absolutely within reach.
This guide breaks down exactly what’s on the test, which topics carry the most weight, what the most commonly missed questions look like, and how to build a study plan that actually works. Whether you’re starting from scratch or looking to push your score over the finish line, this is the resource you need.
How the Science Section Is Structured
ATI divides the TEAS 7 Science section into four content domains. Understanding how many questions fall in each domain is the single most strategic piece of information you can have, as it tells you where to spend your study hours.
Scientific Reasoning
The takeaway is clear: Biology and Anatomy/Physiology together account for roughly 68% of your score. If you’re short on time, these two domains will give you the biggest return on every hour invested.
Biology And Life Science: The Heaviest Hitter
With over a third of the exam, life science is where you’ll either build your score or lose it. The TEAS tests biology at a conceptual level, understanding how processes work, not just naming them.
Cell Biology
You need to know the structure and function of the major cell organelles (nucleus, mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, and cell membrane). Know the difference between prokaryotic and eukaryotic cells, and be comfortable with the cell cycle: interphase, mitosis (prophase, metaphase, anaphase, telophase), and cytokinesis. Meiosis and how it differs from mitosis, particularly its role in sexual reproduction and genetic diversity, is a reliable test topic.
Genetics
Expect questions on DNA structure (double helix, base pairing: A-T and G-C), DNA replication, transcription (DNA → mRNA), and translation (mRNA → protein). Mendelian genetics is heavily tested: understand dominant vs. recessive traits, how to work Punnett squares for monohybrid and dihybrid crosses, and how to calculate genotype and phenotype ratios. Codominance and incomplete dominance often show up as well.
Biological Macromolecules
Know the four major classes of carbohydrates, proteins, lipids, and nucleic acids, along with their monomers and functions. The relationship between enzyme structure and function (including how pH and temperature affect enzyme activity) is a common question type that bridges biology and chemistry.
Ecosystems & Evolution
The TEAS will ask about food chains, food webs, energy pyramids, and ecological relationships (predation, commensalism, mutualism, parasitism). For evolution, know natural selection, adaptation, and the evidence for evolution (fossil record, comparative anatomy, genetic similarities): speciation and the concept of niches round out this topic area.
Human Anatomy And Physiology: Know Your Systems
The A&P domain tests your understanding of the body’s major organ systems, their structure, and their function. This is the most content-heavy section to study, but it’s also one of the most predictable: the same systems and concepts recur.
- Cardiovascular: Heart anatomy, cardiac cycle, blood pressure, blood vessels
- Respiratory: Lung structure, gas exchange, breathing mechanics
- Digestive: GI tract organs, enzymes, nutrient absorption
- Nervous: CNS vs. PNS, neuron structure, action potentials
- Musculoskeletal: Bone structure, muscle types, joints, tendons vs. ligaments
- Endocrine: Major glands, hormones, feedback loops
- Renal/Urinary: Kidney structure, nephron function, urine formation
- Immune/Lymphatic: Innate vs. adaptive immunity, antigens, antibodies
For each system, focus on: the key organs and their specific roles, how the system maintains homeostasis, and how it interacts with other systems. A classic TEAS question asks you to trace a breath of air, a red blood cell, or a bolus of food through the body, and you know the sequence for each.
Chemistry: The Concepts That Count
The TEAS is not a general chemistry exam; it focuses on the foundational chemistry relevant to health sciences. You won’t need calculus or college-level stoichiometry. What you do need is a solid conceptual grasp of the following areas.
Atomic Structure & the Periodic Table
Know the subatomic particles (protons, neutrons, electrons) and where they’re located. Understand atomic number vs. mass number, how to find the number of neutrons, and what isotopes are. Be comfortable with the periodic table’s organization: periods vs. groups, and trends in electronegativity, atomic radius, and ionization energy.
Chemical Bonding & Reactions
Ionic vs. covalent bonds, polar vs. nonpolar molecules, and how molecular structure affects properties like solubility. For reactions, know the major types (synthesis, decomposition, single replacement, double replacement, combustion) and be able to identify reactants vs. products. Balancing chemical equations at a basic level is expected.
Acids, Bases & pH
This is a high-yield topic for nursing and allied health students. Know the pH scale (0–14), what makes a substance acidic or basic, and how pH affects biological systems (blood pH, enzyme function). Understand the concept of buffers and why the body maintains such a narrow pH range. Know the difference between strong and weak acids/bases.
States of Matter & Solutions
The properties of solids, liquids, and gases, including how temperature and pressure affect state changes for solutions: solute, solvent, concentration, and the difference between solutions, suspensions, and colloids. Osmosis and diffusion concepts here dovetail directly with biology.
Scientific Reasoning: Think Like a Researcher
This domain rewards test-takers who understand the scientific method, not just students who’ve memorized facts. Questions here will often present a brief experimental scenario and ask you to analyze it.
The key skills tested include: identifying an experiment’s independent variable (what is deliberately changed), dependent variable (what is measured), and control group (the baseline). You’ll also need to recognize valid vs. invalid conclusions from data, spot flaws in experimental design, and understand what it means for a study to have a large enough sample size or a proper control.
Graphs and data tables appear in this section. Practice reading bar graphs, line graphs, and scatter plots, quickly identify what each axis represents, what the trend shows, and what conclusion is (and is not) supported by the data.
Building a Study Plan That Actually Works
The biggest mistake TEAS test-takers make is passive review, reading a textbook chapter, and thinking they’ve studied it. The TEAS tests application, not recognition. Here’s how to study actively and efficiently.
Use Active Recall, Not Passive Review
After reading a section, close the book and write down everything you remember. Use flashcards for organelle functions, hormone names, and chemical definitions. Apps like Anki use spaced repetition to time your reviews at the optimal moment for long-term retention.
Take Practice Tests Under Timed Conditions
You have about 71 seconds per question in the Science section. Practice tests train your pacing as much as your knowledge. ATI’s official SmartPrep tool offers the most realistic practice questions. Use it. After each practice test, review every wrong answer and understand exactly why the correct answer is right.
Make a Priority List Based on Your Weaknesses
Take a diagnostic practice test first. Identify the domains you’re weakest in, then allocate more study time to them. A student who scores well in biology but struggles with chemistry should reverse the typical time allocation between the two subjects. Know yourself, and study accordingly.
Conclusion
The TEAS Science section may seem overwhelming at first, but with a focused study plan and the right preparation methods, it is entirely manageable. Since this section covers critical topics such as biology, anatomy and physiology, chemistry, and scientific reasoning, mastering these concepts not only helps you achieve a higher TEAS score but also prepares you for the rigorous coursework you’ll encounter in nursing school.
