TEAS 7 Science 2026 Practice Questions and Answers
with Detailed Rationales – Nursing Entrance Exam
1. Human Anatomy & Physiology
Which organelle is primarily responsible for producing ATP during aerobic cellular respiration?
A. Ribosome
B. Mitochondrion
C. Lysosome
D. Golgi apparatus
Answer: B. Mitochondrion
Rationale: Mitochondria generate most of a cell's ATP through aerobic cellular respiration.
Ribosomes synthesize proteins, lysosomes digest cellular materials, and the Golgi apparatus
modifies and packages proteins.
2. Human Anatomy & Physiology
Which chamber of the heart pumps oxygenated blood into the systemic circulation?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Answer: D. Left ventricle
Rationale: The left ventricle pumps oxygenated blood through the aorta to the body's tissues.
The right ventricle pumps deoxygenated blood toward the lungs.
3. Human Anatomy & Physiology
What is the primary function of the alveoli in the lungs?
A. Produce red blood cells
B. Exchange oxygen and carbon dioxide
,C. Filter nitrogen from the blood
D. Produce digestive enzymes
Answer: B. Exchange oxygen and carbon dioxide
Rationale: Alveoli are tiny air sacs surrounded by capillaries. Their thin walls allow oxygen to
diffuse into the blood while carbon dioxide diffuses from the blood into the alveolar air.
4. Biology
Which molecule carries genetic information in most living organisms?
A. ATP
B. DNA
C. Glucose
D. Lipid
Answer: B. DNA
Rationale: DNA stores hereditary information used to direct cellular activities and protein
production. ATP primarily provides cellular energy, while glucose is an energy source.
5. Biology
During mitosis, which event occurs during metaphase?
A. Chromosomes line up at the cell's equator
B. Sister chromatids separate
C. DNA is replicated
D. The nuclear membrane reforms
Answer: A. Chromosomes line up at the cell's equator
Rationale: During metaphase, duplicated chromosomes align along the metaphase plate. Sister
chromatids separate during anaphase.
6. Chemistry
Which subatomic particle has a negative electrical charge?
,A. Proton
B. Neutron
C. Electron
D. Nucleus
Answer: C. Electron
Rationale: Electrons have a negative charge. Protons are positively charged, while neutrons
have no electrical charge.
7. Chemistry
A solution with a pH of 3 is best described as:
A. Strongly acidic
B. Neutral
C. Weakly basic
D. Strongly basic
Answer: A. Strongly acidic
Rationale: The pH scale ranges from acidic values below 7 to basic values above 7. A pH of 3
indicates an acidic solution.
8. Scientific Reasoning
A researcher wants to determine whether increasing fertilizer affects plant growth. Which
variable should the researcher manipulate?
A. Plant height
B. Amount of fertilizer
C. Type of measuring ruler
D. Number of measurements recorded
Answer: B. Amount of fertilizer
Rationale: The independent variable is the factor deliberately changed by the researcher. Here,
that factor is the amount of fertilizer. Plant growth would be the dependent variable.
, 9. Scientific Reasoning
A scientist repeats an experiment several times and obtains similar results. What does this
primarily improve?
A. Reliability
B. Bias
C. Independent variable
D. Experimental temperature
Answer: A. Reliability
Rationale: Repeated experiments that produce consistent results increase confidence in the
reliability and reproducibility of the findings.
10. Human Anatomy & Physiology
Which structure prevents food from entering the trachea during swallowing?
A. Uvula
B. Epiglottis
C. Diaphragm
D. Esophagus
Answer: B. Epiglottis
Rationale: The epiglottis is a flap of tissue that helps cover the airway during swallowing,
directing food toward the esophagus.
11. Biology
Which type of macromolecule is primarily responsible for catalyzing most biological reactions?
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
Answer: C. Proteins
Rationale: Most enzymes are proteins that function as biological catalysts, lowering the
activation energy of chemical reactions.
with Detailed Rationales – Nursing Entrance Exam
1. Human Anatomy & Physiology
Which organelle is primarily responsible for producing ATP during aerobic cellular respiration?
A. Ribosome
B. Mitochondrion
C. Lysosome
D. Golgi apparatus
Answer: B. Mitochondrion
Rationale: Mitochondria generate most of a cell's ATP through aerobic cellular respiration.
Ribosomes synthesize proteins, lysosomes digest cellular materials, and the Golgi apparatus
modifies and packages proteins.
2. Human Anatomy & Physiology
Which chamber of the heart pumps oxygenated blood into the systemic circulation?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Answer: D. Left ventricle
Rationale: The left ventricle pumps oxygenated blood through the aorta to the body's tissues.
The right ventricle pumps deoxygenated blood toward the lungs.
3. Human Anatomy & Physiology
What is the primary function of the alveoli in the lungs?
A. Produce red blood cells
B. Exchange oxygen and carbon dioxide
,C. Filter nitrogen from the blood
D. Produce digestive enzymes
Answer: B. Exchange oxygen and carbon dioxide
Rationale: Alveoli are tiny air sacs surrounded by capillaries. Their thin walls allow oxygen to
diffuse into the blood while carbon dioxide diffuses from the blood into the alveolar air.
4. Biology
Which molecule carries genetic information in most living organisms?
A. ATP
B. DNA
C. Glucose
D. Lipid
Answer: B. DNA
Rationale: DNA stores hereditary information used to direct cellular activities and protein
production. ATP primarily provides cellular energy, while glucose is an energy source.
5. Biology
During mitosis, which event occurs during metaphase?
A. Chromosomes line up at the cell's equator
B. Sister chromatids separate
C. DNA is replicated
D. The nuclear membrane reforms
Answer: A. Chromosomes line up at the cell's equator
Rationale: During metaphase, duplicated chromosomes align along the metaphase plate. Sister
chromatids separate during anaphase.
6. Chemistry
Which subatomic particle has a negative electrical charge?
,A. Proton
B. Neutron
C. Electron
D. Nucleus
Answer: C. Electron
Rationale: Electrons have a negative charge. Protons are positively charged, while neutrons
have no electrical charge.
7. Chemistry
A solution with a pH of 3 is best described as:
A. Strongly acidic
B. Neutral
C. Weakly basic
D. Strongly basic
Answer: A. Strongly acidic
Rationale: The pH scale ranges from acidic values below 7 to basic values above 7. A pH of 3
indicates an acidic solution.
8. Scientific Reasoning
A researcher wants to determine whether increasing fertilizer affects plant growth. Which
variable should the researcher manipulate?
A. Plant height
B. Amount of fertilizer
C. Type of measuring ruler
D. Number of measurements recorded
Answer: B. Amount of fertilizer
Rationale: The independent variable is the factor deliberately changed by the researcher. Here,
that factor is the amount of fertilizer. Plant growth would be the dependent variable.
, 9. Scientific Reasoning
A scientist repeats an experiment several times and obtains similar results. What does this
primarily improve?
A. Reliability
B. Bias
C. Independent variable
D. Experimental temperature
Answer: A. Reliability
Rationale: Repeated experiments that produce consistent results increase confidence in the
reliability and reproducibility of the findings.
10. Human Anatomy & Physiology
Which structure prevents food from entering the trachea during swallowing?
A. Uvula
B. Epiglottis
C. Diaphragm
D. Esophagus
Answer: B. Epiglottis
Rationale: The epiglottis is a flap of tissue that helps cover the airway during swallowing,
directing food toward the esophagus.
11. Biology
Which type of macromolecule is primarily responsible for catalyzing most biological reactions?
A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
Answer: C. Proteins
Rationale: Most enzymes are proteins that function as biological catalysts, lowering the
activation energy of chemical reactions.
