ATI TEAS 7 Science Section Guide: What Is on It and How to Study

The ATI TEAS 7 Science section is the most content-heavy portion of the exam and the one that most nursing school applicants underestimate. It covers four distinct content areas across 50 questions in 60 minutes, requiring both broad knowledge and efficient test-taking strategy. This guide tells you exactly what to expect and how to prepare.

TEAS 7 Science Section Overview

The Science section of the TEAS 7 contains 50 scored questions (plus a small number of unscored pretest items) and is allotted 60 minutes. The content is divided into four main areas according to ATI:

• Human Anatomy and Physiology — approximately 18 questions (36%)
• Biology — approximately 9 questions (18%)
• Chemistry — approximately 8 questions (16%)
• Scientific Reasoning — approximately 15 questions (30%)

Anatomy and Physiology carries the most weight, so prioritize it first if you are short on study time.

Anatomy and Physiology: The Core of TEAS Science

The A and P content spans all major body systems. Focus especially on systems that nursing programs emphasize in their first year:

• Cardiovascular: cardiac cycle, blood pressure regulation, components of blood
• Respiratory: ventilation mechanics, gas exchange, lung volumes
• Renal: nephron structure, filtration, electrolyte balance
• Nervous: neuron structure, action potential, central vs. peripheral nervous system
• Endocrine: major hormones and their target organs (insulin, cortisol, thyroid hormones)
• Musculoskeletal: muscle contraction mechanism, bone types, joint classifications
• Reproductive and Immune: cell types, immune response basics, reproductive cycle

You do not need to memorize every clinical detail — TEAS questions focus on fundamental structure and function, not pathology.

Biology Topics to Review

The Biology subsection tests foundational life science concepts:

• Cell biology: cell organelles and their functions, prokaryotic vs. eukaryotic cells, cell membrane transport (diffusion, osmosis, active transport)
• Genetics: DNA replication, transcription, translation, Mendelian inheritance patterns, Punnett squares
• Evolution and ecology: natural selection, ecosystem relationships, nutrient cycles
• Macromolecules: carbohydrates, proteins, lipids, and nucleic acids — structure and function

Cell membrane transport and protein synthesis appear repeatedly. Be able to distinguish passive from active transport and trace the path from gene to protein.

Chemistry Topics to Review

TEAS Chemistry questions test high-school-level general chemistry. Key topics include:

• Atomic structure: protons, neutrons, electrons, atomic number vs. mass number
• Periodic table: element families, trends in electronegativity and atomic radius
• Chemical bonding: ionic vs. covalent bonds, polarity
• Chemical reactions: balancing equations, types of reactions (synthesis, decomposition, combustion)
• Acids and bases: pH scale, buffers, strong vs. weak acids
• Solutions: solubility, concentration, molarity basics

Pay close attention to pH and buffer chemistry — this directly relates to nursing content on acid-base balance and appears on both TEAS and future nursing coursework.

Scientific Reasoning: A High-Yield and Underrated Subsection

Many students neglect Scientific Reasoning because it does not feel like memorizable content — but that is exactly why it is valuable. These questions reward logical thinking and can be answered without prior science knowledge:

• Experimental design: identifying independent and dependent variables, control groups, hypotheses
• Data interpretation: reading graphs, tables, and charts to draw conclusions
• Scientific method: the sequence of inquiry from observation to conclusion
• Validity and reliability: understanding what makes research findings trustworthy

Practice reading unfamiliar graphs and asking: What does the x-axis represent? What does the y-axis represent? What conclusion does the data support? This skill transfers directly to nursing practice and research literacy.

Study Strategy for TEAS 7 Science

A structured plan beats random review every time. Use this approach:

1. Take a diagnostic practice test first to identify your weakest content areas
2. Allocate study time by weight: spend roughly half your science study time on A and P, then distribute the rest across biology, chemistry, and scientific reasoning proportionally
3. Use active recall: cover your notes and recite body system functions from memory rather than re-reading
4. Draw diagrams: sketching the nephron, the cardiac cycle, or the respiratory tract from memory solidifies spatial understanding
5. Practice timed sections: 60 minutes for 50 questions means about 72 seconds per question — practice at this pace to build fluency
6. Review every wrong answer: note which content area it belongs to and revisit that topic within 48 hours