ATI TEAS 7 SCIENCE ACTUAL EXAM 2026/2027 –QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
CORE DOMAINS
- Human Anatomy and Physiology
- Biology and Cellular Processes
- Chemistry and Chemical Reactions
- Scientific Reasoning and Methodology
- Physics and Physical Properties
- Genetics and Hereditary Patterns
- Infectious Disease and Microbiology
- Laboratory Equipment and Safety Protocols
INTRODUCTION
The purpose of this comprehensive assessment is to evaluate the competency and readiness of individuals
entering health-related fields. This exam rigorously assesses a candidate’s foundational knowledge in the natural
and physical sciences, ensuring they possess the analytical skills necessary for clinical success. The structure
includes a blend of multiple-choice questions and scenario-based inquiries designed to mirror real-world
healthcare environments. Emphasis is placed on critical thinking, ethical scientific inquiry, and the application of
theoretical concepts to practical decision-making. By navigating these complex assessments, candidates
demonstrate their mastery of the core scientific principles required for advanced professional practice.
SECTION ONE: QUESTIONS 1–100
1. Which of the following organelles is responsible for the synthesis of lipids and the detoxification of harmful
substances?
,A. Ribosomes
B. Rough Endoplasmic Reticulum
🟢 C. Smooth Endoplasmic Reticulum
D. Golgi Apparatus
🔴 RATIONALE: The Smooth Endoplasmic Reticulum is responsible for lipid synthesis, carbohydrate metabolism,
and detoxification, whereas the Rough ER is primarily involved in protein synthesis.
2. A researcher is studying the effect of sunlight on plant growth. In this experiment, the amount of water
provided to each plant is considered which of the following?
🟢 A. Controlled variable
B. Independent variable
C. Dependent variable
D. Hypothesis
🔴 RATIONALE: A controlled variable is a factor that is kept constant across all groups in an experiment to ensure
that the results are due to the independent variable alone.
3. Which of the following valves prevents the backflow of blood from the right ventricle into the right atrium?
A. Mitral valve
B. Aortic valve
🟢 C. Tricuspid valve
D. Pulmonary valve
🔴 RATIONALE: The tricuspid valve is the atrioventricular valve located between the right atrium and the right
ventricle; it closes during ventricular contraction to prevent backflow.
, 4. In the periodic table, which of the following elements has the highest electronegativity?
A. Oxygen
🟢 B. Fluorine
C. Chlorine
D. Neon
🔴 RATIONALE: Electronegativity increases as you move up and to the right on the periodic table. Fluorine is the
most electronegative element, excluding noble gases.
5. Which of the following structures in the respiratory system is the primary site of gas exchange?
A. Bronchioles
B. Pharynx
C. Trachea
🟢 D. Alveoli
🔴 RATIONALE: Alveoli are tiny air sacs at the end of the respiratory tree where oxygen and carbon dioxide are
exchanged between the lungs and the bloodstream.
6. A patient presents with a condition that causes the body to attack its own myelin sheath. Which of the
following nervous system cells is primarily affected?
A. Neurons
🟢 B. Oligodendrocytes
C. Microglia
D. Astrocytes
, 🔴 RATIONALE: Oligodendrocytes in the Central Nervous System (and Schwann cells in the PNS) produce the
myelin sheath; their destruction impairs signal transmission.
7. Which of the following best describes the process of osmosis?
🟢 A. The movement of water from an area of low solute concentration to high solute concentration.
B. The movement of solutes from an area of high concentration to low concentration.
C. The movement of water from an area of high solute concentration to low solute concentration.
D. The active transport of ions across a semipermeable membrane.
🔴 RATIONALE: Osmosis is specifically the passive movement of water across a semipermeable membrane
toward a higher concentration of solutes to achieve equilibrium.
8. Which type of bond is formed when electrons are shared equally between two atoms?
A. Ionic bond
B. Polar covalent bond
🟢 C. Nonpolar covalent bond
D. Hydrogen bond
🔴 RATIONALE: Nonpolar covalent bonds occur when the electronegativity difference between atoms is
negligible, resulting in equal sharing of electrons.
9. Which of the following is a function of the integumentary system?
A. Production of red blood cells
🟢 B. Thermoregulation
C. Synthesis of adrenaline
D. Regulation of blood glucose levels
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
CORE DOMAINS
- Human Anatomy and Physiology
- Biology and Cellular Processes
- Chemistry and Chemical Reactions
- Scientific Reasoning and Methodology
- Physics and Physical Properties
- Genetics and Hereditary Patterns
- Infectious Disease and Microbiology
- Laboratory Equipment and Safety Protocols
INTRODUCTION
The purpose of this comprehensive assessment is to evaluate the competency and readiness of individuals
entering health-related fields. This exam rigorously assesses a candidate’s foundational knowledge in the natural
and physical sciences, ensuring they possess the analytical skills necessary for clinical success. The structure
includes a blend of multiple-choice questions and scenario-based inquiries designed to mirror real-world
healthcare environments. Emphasis is placed on critical thinking, ethical scientific inquiry, and the application of
theoretical concepts to practical decision-making. By navigating these complex assessments, candidates
demonstrate their mastery of the core scientific principles required for advanced professional practice.
SECTION ONE: QUESTIONS 1–100
1. Which of the following organelles is responsible for the synthesis of lipids and the detoxification of harmful
substances?
,A. Ribosomes
B. Rough Endoplasmic Reticulum
🟢 C. Smooth Endoplasmic Reticulum
D. Golgi Apparatus
🔴 RATIONALE: The Smooth Endoplasmic Reticulum is responsible for lipid synthesis, carbohydrate metabolism,
and detoxification, whereas the Rough ER is primarily involved in protein synthesis.
2. A researcher is studying the effect of sunlight on plant growth. In this experiment, the amount of water
provided to each plant is considered which of the following?
🟢 A. Controlled variable
B. Independent variable
C. Dependent variable
D. Hypothesis
🔴 RATIONALE: A controlled variable is a factor that is kept constant across all groups in an experiment to ensure
that the results are due to the independent variable alone.
3. Which of the following valves prevents the backflow of blood from the right ventricle into the right atrium?
A. Mitral valve
B. Aortic valve
🟢 C. Tricuspid valve
D. Pulmonary valve
🔴 RATIONALE: The tricuspid valve is the atrioventricular valve located between the right atrium and the right
ventricle; it closes during ventricular contraction to prevent backflow.
, 4. In the periodic table, which of the following elements has the highest electronegativity?
A. Oxygen
🟢 B. Fluorine
C. Chlorine
D. Neon
🔴 RATIONALE: Electronegativity increases as you move up and to the right on the periodic table. Fluorine is the
most electronegative element, excluding noble gases.
5. Which of the following structures in the respiratory system is the primary site of gas exchange?
A. Bronchioles
B. Pharynx
C. Trachea
🟢 D. Alveoli
🔴 RATIONALE: Alveoli are tiny air sacs at the end of the respiratory tree where oxygen and carbon dioxide are
exchanged between the lungs and the bloodstream.
6. A patient presents with a condition that causes the body to attack its own myelin sheath. Which of the
following nervous system cells is primarily affected?
A. Neurons
🟢 B. Oligodendrocytes
C. Microglia
D. Astrocytes
, 🔴 RATIONALE: Oligodendrocytes in the Central Nervous System (and Schwann cells in the PNS) produce the
myelin sheath; their destruction impairs signal transmission.
7. Which of the following best describes the process of osmosis?
🟢 A. The movement of water from an area of low solute concentration to high solute concentration.
B. The movement of solutes from an area of high concentration to low concentration.
C. The movement of water from an area of high solute concentration to low solute concentration.
D. The active transport of ions across a semipermeable membrane.
🔴 RATIONALE: Osmosis is specifically the passive movement of water across a semipermeable membrane
toward a higher concentration of solutes to achieve equilibrium.
8. Which type of bond is formed when electrons are shared equally between two atoms?
A. Ionic bond
B. Polar covalent bond
🟢 C. Nonpolar covalent bond
D. Hydrogen bond
🔴 RATIONALE: Nonpolar covalent bonds occur when the electronegativity difference between atoms is
negligible, resulting in equal sharing of electrons.
9. Which of the following is a function of the integumentary system?
A. Production of red blood cells
🟢 B. Thermoregulation
C. Synthesis of adrenaline
D. Regulation of blood glucose levels
