Title Description: "Ace the 2025 ATI TEAS 7 Science: Comprehensive Study Guide and Strategies"

ATI TEAS 7 SCIENCES

Below is a set of 100 sample revision questions for the ATI TEAS 7 Science section, each followed by the
correct answer and an explanation (rationale) to help you understand the concept behind the question.



Question 1: Cellular Structure

Question: Which organelle is known as the “powerhouse of the cell” because it produces adenosine
triphosphate (ATP)?

 A. Nucleus

 B. Mitochondrion

 C. Ribosome

 D. Endoplasmic Reticulum

Correct Answer: B. Mitochondrion

Rationale: Mitochondria are responsible for generating ATP through cellular respiration. This energy is
used by the cell for various metabolic activities, making mitochondria essential for energy production.



Question 2: Protein Synthesis

Question: What is the primary function of ribosomes in a cell?

 A. Lipid synthesis

 B. DNA replication

 C. Protein synthesis

 D. Waste removal

Correct Answer: C. Protein synthesis

Rationale: Ribosomes are the sites of protein synthesis. They link amino acids together in the order
specified by messenger RNA (mRNA), forming polypeptide chains that fold into functional proteins.



Question 3: Scientific Method

Question: Which step in the scientific method involves formulating a testable explanation for an
observation?

,  A. Observation

 B. Hypothesis

 C. Experimentation

 D. Conclusion

Correct Answer: B. Hypothesis

Rationale: A hypothesis is a testable, tentative explanation for an observation. It is formed based on
prior knowledge and research, and then experiments are designed to test its validity.



Question 4: Human Anatomy

Question: Which body system is primarily responsible for transporting oxygen, nutrients, and waste
products throughout the body?

 A. Respiratory system

 B. Digestive system

 C. Circulatory system

 D. Nervous system

Correct Answer: C. Circulatory system

Rationale: The circulatory system, composed of the heart, blood, and blood vessels, transports essential
substances such as oxygen and nutrients to cells while carrying waste products away for elimination.



Question 5: States of Matter

Question: Which state of matter has a definite shape and a definite volume?

 A. Solid

 B. Liquid

 C. Gas

 D. Plasma

Correct Answer: A. Solid

Rationale: Solids have fixed shapes and volumes because their particles are tightly packed in a fixed
arrangement, allowing only vibrational movement, unlike liquids and gases which have more freedom of
movement.

,Question 6: Earth and Space Science

Question: What is the process called in which water vapor in the air cools and changes into liquid water?

 A. Evaporation

 B. Condensation

 C. Sublimation

 D. Precipitation

Correct Answer: B. Condensation

Rationale: Condensation is the process where water vapor loses energy, cools down, and converts into
liquid water. This process is a key step in the water cycle and is responsible for forming clouds.



Question 7: Genetics

Question: In a monohybrid cross between a homozygous dominant individual (AA) and a homozygous
recessive individual (aa), what will be the genotype of all the offspring?

 A. AA

 B. Aa

 C. aa

 D. 50% Aa and 50% aa

Correct Answer: B. Aa

Rationale: When a homozygous dominant (AA) is crossed with a homozygous recessive (aa), all offspring
receive one dominant allele (A) from one parent and one recessive allele (a) from the other, making
them heterozygous (Aa). This is a fundamental concept in Mendelian genetics.



Question 8: Ecology

Question: Which term best describes the complex interactions between living organisms and their
physical environment?

 A. Community

 B. Ecosystem

 C. Habitat

 D. Population

Correct Answer: B. Ecosystem

, Rationale: An ecosystem encompasses all living organisms (biotic factors) and the nonliving elements
(abiotic factors) in a specific area, interacting as a system. This holistic view of life and environment is
central to ecological studies.



Question 9: Chemical Reactions

Question: In an exothermic reaction, what is released to the surroundings?

 A. Light

 B. Heat

 C. Work

 D. Matter

Correct Answer: B. Heat

Rationale: Exothermic reactions release energy in the form of heat. This energy release occurs because
the energy required to break the bonds in the reactants is less than the energy released when new
bonds form in the products.



Question 10: Scientific Tools

Question: Which instrument is used to measure atmospheric pressure?

 A. Thermometer

 B. Hygrometer

 C. Barometer

 D. Anemometer

Correct Answer: C. Barometer

Rationale: A barometer is used to measure atmospheric pressure. Changes in atmospheric pressure can
indicate upcoming weather patterns, making barometers important tools in meteorology.



These questions cover a range of topics typically included in the ATI TEAS 7 Science exam. Use these
along with your study materials to review key scientific concepts, and be sure to understand the
rationale behind each answer to help you excel on test day.



Question 11: Cellular Transport

Question: Which process requires the cell to use energy (ATP) to move molecules against a
concentration gradient?