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Quizzes > Science

TEAS Science Practice Test: 15 Questions to Check Your Knowledge

Quick quiz with realistic TEAS science questions. Instant results.

Editorial: Review CompletedCreated By: Isla BrisbaneUpdated Aug 23, 2025
Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art depicting elements related to TEAS Science Practice Quiz

Use this TEAS science practice test to check your grasp of biology, chemistry, and scientific reasoning in 15 quick questions. See your score instantly, spot weak areas, and know what to review next. For extra practice, try our free teas practice test, a general chemistry quiz, or a biology practice test.

What is considered the basic unit of life?
Atom
Tissue
Cell
Molecule
The cell is the smallest structure that meets all the criteria of life, including metabolism and reproduction. Atoms and molecules form cells, while tissues are groups of cells.
Which organelle is known as the powerhouse of the cell?
Mitochondrion
Lysosome
Golgi apparatus
Ribosome
Mitochondria generate ATP through oxidative phosphorylation, supplying energy for cellular processes. Other organelles have different functions such as protein synthesis or digestion of macromolecules.
Which pH value indicates a neutral aqueous solution?
pH 3
pH 13
pH 10
pH 7
A pH of 7 is defined as neutral, where hydrogen ion concentration equals hydroxide ion concentration. Values below 7 are acidic and above 7 are basic.
What is the SI unit for force?
Watt
Newton
Pascal
Joule
The SI unit of force is the newton (N), defined as kg·m/s². A pascal is a unit of pressure, a joule is energy, and a watt is power.
In an experiment, the group that does not receive the experimental treatment is called the:
Placebo group
Experimental group
Hypothesis group
Control group
The control group serves as a baseline by not receiving the treatment, allowing comparison to the experimental group. Placebo groups are used in certain clinical trials but are a type of control.
An enzyme kinetics graph shows reaction rate leveling off at high substrate concentration. What does this plateau indicate?
Enzyme denaturation
Allosteric activation
Enzyme saturation
Product inhibition
At high substrate concentration, all enzyme active sites are occupied, resulting in maximum velocity (Vmax). This plateau indicates enzyme saturation rather than inhibition or denaturation.
Which of the following is the balanced chemical equation for cellular respiration?
6CO2 + 6H2O ' C6H12O6 + 6O2
C6H12O6 ' 2C2H5OH + 2CO2
C3H6O3 + O2 ' 3CO2 + 3H2O
C6H12O6 + 6O2 ' 6CO2 + 6H2O + ATP
Cellular respiration converts glucose and oxygen into carbon dioxide, water, and ATP. The reverse equation represents photosynthesis, and the others describe fermentation or are unbalanced.
In a monohybrid cross between two heterozygous individuals (Aa - Aa), what phenotypic ratio is expected in the F2 generation?
1:2:1
3:1
1:1
9:3:3:1
A monohybrid cross of two heterozygotes yields three dominant to one recessive phenotype. The 9:3:3:1 ratio applies to dihybrid crosses.
If a force of 10 N is applied uniformly over an area of 2 m², what is the resulting pressure?
0.2 Pa
5 Pa
20 Pa
12 Pa
Pressure is force divided by area: P = 10 N / 2 m² = 5 Pa. The other values come from incorrect divisions or multiplications.
What type of chemical bond involves the sharing of electron pairs between atoms?
Hydrogen bond
Covalent bond
Ionic bond
Van der Waals interaction
Covalent bonds form when atoms share pairs of electrons to achieve stable electron configurations. Ionic bonds transfer electrons, and hydrogen/Van der Waals are weaker intermolecular forces.
In an exothermic reaction at equilibrium, adding heat causes the equilibrium to shift in which direction according to Le Chatelier's principle?
No shift
Equally in both directions
To the right (products)
To the left (reactants)
In an exothermic reaction heat is a product; adding heat shifts equilibrium toward reactants (left) to consume excess heat. Removing heat would shift it right.
Which description best fits competitive enzyme inhibition?
Inhibitor binds to active site
Inhibitor binds to allosteric site
Inhibitor increases Km and Vmax
Inhibitor permanently degrades enzyme
Competitive inhibitors resemble the substrate and bind reversibly to the active site, raising Km but not changing Vmax. Allosteric binding is non-competitive.
Which organelle is primarily involved in lipid synthesis and detoxification in eukaryotic cells?
Smooth endoplasmic reticulum
Peroxisome
Golgi apparatus
Rough endoplasmic reticulum
The smooth endoplasmic reticulum synthesizes lipids and detoxifies xenobiotics. The rough ER has ribosomes for protein synthesis, while peroxisomes breakdown fatty acids.
In an electrical circuit with 12 V applied across a 4 Ω resistor, what current flows through the resistor?
3 A
8 A
48 A
0.33 A
Ohm's law states I = V / R. Thus I = 12 V / 4 Ω = 3 A. The other options result from incorrect calculations.
Random assignment of subjects in an experiment primarily helps to reduce which type of bias?
Selection bias
Measurement bias
Publication bias
Confirmation bias
Random assignment ensures groups are comparable, reducing selection bias. Measurement bias relates to data collection, and the others relate to reporting or interpretation.
In Michaelis-Menten kinetics, what does the Michaelis constant (Km) represent?
Substrate concentration at which reaction rate is zero
Enzyme concentration at half activity
Maximum reaction rate
Substrate concentration at half Vmax
Km is the substrate concentration at which the reaction rate is half of Vmax, reflecting enzyme affinity for the substrate. A lower Km indicates higher affinity.
During prokaryotic DNA replication, which enzyme removes RNA primers and replaces them with DNA nucleotides?
DNA helicase
DNA polymerase I
Primase
DNA ligase
DNA polymerase I in prokaryotes excises RNA primers and fills the gaps with DNA. DNA ligase seals remaining nicks; helicase unwinds DNA; primase synthesizes primers.
A 100 µF capacitor is charged to 10 V. How much energy is stored in the capacitor?
5 J
0.005 J
50 J
0.05 J
Energy stored is (1/2) C V² = 0.5 - 100-10❻❶ F - (10 V)² = 0.005 J. The other values result from incorrect application of the formula.
What is the main advantage of a double-blind clinical trial design?
Eliminates measurement error
Prevents selection bias
Ensures faster data collection
Reduces both researcher and participant biases
Double-blind designs keep both researchers and participants unaware of group assignments, minimizing observer and placebo effects. It does not directly affect measurement precision or speed.
One mole of an ideal gas undergoes a reversible isothermal expansion at 300 K, doubling its volume. What is the change in entropy?
5.76 J/K
0.00576 J/K
5.76 J
8.314 J/K
ΔS = nR ln(V₂/V₝) = 1-8.314 J/mol·K-ln(2) ≈5.76 J/K. The units must be J/K, and the other values come from unit or numerical errors.
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Learning Outcomes

  1. Analyse scientific data and charts confidently
  2. Identify key biological and chemical principles
  3. Apply physics concepts to real-world scenarios
  4. Evaluate experimental designs and methodologies
  5. Master terminology with targeted science vocabulary
  6. Demonstrate readiness for the TEAS Science exam

Cheat Sheet

  1. Eukaryotic Cell Structure & Function - Think of a eukaryotic cell as a bustling metropolis: the nucleus holds the master blueprint (DNA), mitochondria are the power plants generating ATP, and ribosomes are the factories assembling proteins. It's your job to remember who does what, so try the mnemonic "Naughty Mice Run" for Nucleus, Mitochondria, Ribosomes. Once you've got the basics down, you'll see how these parts team up to keep every cell humming along!
  2. Human Body Organ Systems - Your body runs on collaboration between systems: the respiratory system brings in oxygen, the cardiovascular system transports it around like an express courier, and the digestive system fuels the whole show with nutrients. Picture a relay race where each system hands off to the next - understanding that handoff is key to ace this topic.
  3. Basics of Genetics - DNA is a double helix made of A-T and C-G base pairs, and genes are the special segments that code for proteins. To lock in those base pairs, remember "Apples in the Tree" (A with T) and "Cars in the Garage" (C with G). With that trick, you'll decode inheritance patterns like a pro!
  4. Periodic Table Trends - The periodic table is like a map to element behavior: electronegativity climbs as you move right across a period, and atomic radius shrinks. Spotting these trends helps you predict how elements will react - think of it as reading a weather forecast for chemistry!
  5. Chemical Bonds - Bonds are the glue in chemistry: ionic bonds form when electrons are donated, covalent bonds share electrons like best friends trading secrets, and hydrogen bonds are the polite nods between polar molecules. Remember, "Ionic is giving, covalent is sharing" to keep it straight.
  6. States of Matter & Phase Changes - Solids, liquids, and gases love to change roles when heat enters or exits the scene: melting turns solids to liquids, freezing turns liquids to solids, and evaporation sends liquids airborne as gas. The phrase "Mighty Frogs Evade" keeps Melting, Freezing, Evaporation in order - no more mix-ups!
  7. Acids, Bases & pH Scale - pH measures how fiery or chill a solution is: acids score below 7, bases above, and 7 is the calm neutral zone. To nail this, chant "Acidic is low, basic is high" - it's as easy as that!
  8. Scientific Method - Science is a game plan of Observation, Hypothesis, Experiment, and Data analysis (sometimes wrapped up in a Conclusion). Use "Only Happy Elephants Dance" to remember each step and you'll be designing experiments like a mini Einstein in no time.
  9. Osmosis & Diffusion - Diffusion spreads molecules from crowded zones to emptier spaces, while osmosis specifically moves water across a semi-permeable membrane. Keep it simple: "Diffusion is for all, osmosis is for water" and you'll ace membrane transport every time.
  10. Reaction Rates & Equilibrium - Reaction speed is influenced by Temperature, Concentration, and Catalysts - the classic TCC trio. When forward and reverse rates match, the system reaches equilibrium and it's a chemical stand-off!
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