ATI TEAS 7 Science Exam Prep 2026 |
Practice Questions with Verified Answers &
Detailed Explanations | Comprehensive
Study Guide
ATI TEAS 7 SCIENCE EXAM PREP 2026 | PRACTICE QUESTIONS WITH VERIFIED
ANSWERS & DETAILED EXPLANATIONS
OVERVIEW
• This comprehensive study guide contains 200 verified practice questions designed
to mirror the ATI TEAS 7 Science examination format, offering systematic coverage
of Life Science, Physical Science, and Earth & Space Science domains with detailed
explanations to strengthen conceptual understanding.
• Study this material by working through questions systematically, reviewing
rationales for both correct and incorrect options, and identifying knowledge gaps to
focus remediation efforts before test day.
LIFE SCIENCE QUESTIONS
1. Which organelle is responsible for producing ATP through cellular
respiration?
A) Ribosome
B) Golgi apparatus
C) Mitochondrion
D) Centrosome
E) Lysosome
✓ CORRECT ANSWER: C) Mitochondrion
RATIONALE: The mitochondrion is the powerhouse of the cell, containing enzymes
necessary for aerobic cellular respiration. This organelle produces ATP (adenosine
triphosphate), the primary energy currency of the cell, through oxidative
phosphorylation. Ribosomes synthesize proteins, the Golgi apparatus processes
,and packages proteins, centrosomes organize microtubules, and lysosomes contain
digestive enzymes.
2. What is the primary function of the cell membrane?
A) Store genetic material and regulate cell division
B) Control the movement of substances in and out of the cell while protecting cell
contents
C) Synthesize proteins for cellular functions
D) Break down waste products and maintain cellular homeostasis
E) Provide structural support and maintain cell shape
✓ CORRECT ANSWER: B) Control the movement of substances in and out of the
cell while protecting cell contents
RATIONALE: The cell membrane, composed of a phospholipid bilayer with
embedded proteins, is selectively permeable and controls the transport of
molecules in and out of the cell. It provides protection while allowing necessary
substances to enter and waste to exit. The nucleus stores genetic material,
ribosomes synthesize proteins, lysosomes break down waste, and the cell wall (in
plants) provides structural support.
3. During which phase of meiosis do homologous chromosomes separate?
A) Prophase I
B) Metaphase I
C) Anaphase I
D) Telophase II
E) Anaphase II
✓ CORRECT ANSWER: C) Anaphase I
,RATIONALE: During Anaphase I of meiosis I, homologous chromosome pairs
separate and move toward opposite poles of the cell. This separation reduces the
chromosome number by half. Prophase I involves synapsis and crossing over,
Metaphase I involves alignment at the cell equator, Telophase II completes meiosis
II, and Anaphase II involves sister chromatid separation.
4. Which of the following best describes the relationship between genotype
and phenotype?
A) Genotype is the observable trait; phenotype is the genetic makeup
B) Genotype is the genetic makeup; phenotype is the observable trait
C) Genotype and phenotype are identical in all organisms
D) Phenotype determines genotype in sexually reproducing organisms
E) Genotype only exists in prokaryotic cells while phenotype exists in eukaryotes
✓ CORRECT ANSWER: B) Genotype is the genetic makeup; phenotype is the
observable trait
RATIONALE: Genotype refers to the genetic composition of an organism (e.g., Aa
for a heterozygous individual), while phenotype refers to the observable physical or
biochemical characteristics expressed by that genotype (e.g., dominant trait
appearance). These are distinct concepts; the same genotype can produce different
phenotypes depending on environmental factors.
5. What is the primary role of ATP in cells?
A) Store and transmit genetic information
B) Provide energy for cellular processes by breaking high-energy phosphate bonds
C) Regulate enzyme activity and protein synthesis
D) Maintain the structure of the cell membrane
E) Facilitate gas exchange between cells
, ✓ CORRECT ANSWER: B) Provide energy for cellular processes by breaking
high-energy phosphate bonds
RATIONALE: ATP serves as the universal energy currency in cells. When the
terminal phosphate bond is broken (ATP → ADP + phosphate), large amounts of
energy are released that cells use for muscle contraction, biosynthesis, active
transport, and other metabolic processes. ATP is regenerated through cellular
respiration.
6. Which structure in animal cells is responsible for organizing microtubules
and plays a key role in cell division?
A) Centrosome
B) Ribosome
C) Endoplasmic reticulum
D) Cilia
E) Nucleolus
✓ CORRECT ANSWER: A) Centrosome
RATIONALE: The centrosome, containing a pair of centrioles, serves as the main
microtubule organizing center (MTOC) in animal cells. It plays a critical role in
organizing the spindle fibers during cell division. Ribosomes synthesize proteins,
the ER synthesizes membrane and secreted proteins, cilia are motile structures,
and the nucleolus produces ribosomal RNA.
7. What is the function of the smooth endoplasmic reticulum?
A) Synthesis of proteins destined for secretion
B) Synthesis of lipids and carbohydrates; detoxification of harmful substances
C) Storage of calcium ions and synthesis of ATP
D) Transport of proteins to the Golgi apparatus only
Practice Questions with Verified Answers &
Detailed Explanations | Comprehensive
Study Guide
ATI TEAS 7 SCIENCE EXAM PREP 2026 | PRACTICE QUESTIONS WITH VERIFIED
ANSWERS & DETAILED EXPLANATIONS
OVERVIEW
• This comprehensive study guide contains 200 verified practice questions designed
to mirror the ATI TEAS 7 Science examination format, offering systematic coverage
of Life Science, Physical Science, and Earth & Space Science domains with detailed
explanations to strengthen conceptual understanding.
• Study this material by working through questions systematically, reviewing
rationales for both correct and incorrect options, and identifying knowledge gaps to
focus remediation efforts before test day.
LIFE SCIENCE QUESTIONS
1. Which organelle is responsible for producing ATP through cellular
respiration?
A) Ribosome
B) Golgi apparatus
C) Mitochondrion
D) Centrosome
E) Lysosome
✓ CORRECT ANSWER: C) Mitochondrion
RATIONALE: The mitochondrion is the powerhouse of the cell, containing enzymes
necessary for aerobic cellular respiration. This organelle produces ATP (adenosine
triphosphate), the primary energy currency of the cell, through oxidative
phosphorylation. Ribosomes synthesize proteins, the Golgi apparatus processes
,and packages proteins, centrosomes organize microtubules, and lysosomes contain
digestive enzymes.
2. What is the primary function of the cell membrane?
A) Store genetic material and regulate cell division
B) Control the movement of substances in and out of the cell while protecting cell
contents
C) Synthesize proteins for cellular functions
D) Break down waste products and maintain cellular homeostasis
E) Provide structural support and maintain cell shape
✓ CORRECT ANSWER: B) Control the movement of substances in and out of the
cell while protecting cell contents
RATIONALE: The cell membrane, composed of a phospholipid bilayer with
embedded proteins, is selectively permeable and controls the transport of
molecules in and out of the cell. It provides protection while allowing necessary
substances to enter and waste to exit. The nucleus stores genetic material,
ribosomes synthesize proteins, lysosomes break down waste, and the cell wall (in
plants) provides structural support.
3. During which phase of meiosis do homologous chromosomes separate?
A) Prophase I
B) Metaphase I
C) Anaphase I
D) Telophase II
E) Anaphase II
✓ CORRECT ANSWER: C) Anaphase I
,RATIONALE: During Anaphase I of meiosis I, homologous chromosome pairs
separate and move toward opposite poles of the cell. This separation reduces the
chromosome number by half. Prophase I involves synapsis and crossing over,
Metaphase I involves alignment at the cell equator, Telophase II completes meiosis
II, and Anaphase II involves sister chromatid separation.
4. Which of the following best describes the relationship between genotype
and phenotype?
A) Genotype is the observable trait; phenotype is the genetic makeup
B) Genotype is the genetic makeup; phenotype is the observable trait
C) Genotype and phenotype are identical in all organisms
D) Phenotype determines genotype in sexually reproducing organisms
E) Genotype only exists in prokaryotic cells while phenotype exists in eukaryotes
✓ CORRECT ANSWER: B) Genotype is the genetic makeup; phenotype is the
observable trait
RATIONALE: Genotype refers to the genetic composition of an organism (e.g., Aa
for a heterozygous individual), while phenotype refers to the observable physical or
biochemical characteristics expressed by that genotype (e.g., dominant trait
appearance). These are distinct concepts; the same genotype can produce different
phenotypes depending on environmental factors.
5. What is the primary role of ATP in cells?
A) Store and transmit genetic information
B) Provide energy for cellular processes by breaking high-energy phosphate bonds
C) Regulate enzyme activity and protein synthesis
D) Maintain the structure of the cell membrane
E) Facilitate gas exchange between cells
, ✓ CORRECT ANSWER: B) Provide energy for cellular processes by breaking
high-energy phosphate bonds
RATIONALE: ATP serves as the universal energy currency in cells. When the
terminal phosphate bond is broken (ATP → ADP + phosphate), large amounts of
energy are released that cells use for muscle contraction, biosynthesis, active
transport, and other metabolic processes. ATP is regenerated through cellular
respiration.
6. Which structure in animal cells is responsible for organizing microtubules
and plays a key role in cell division?
A) Centrosome
B) Ribosome
C) Endoplasmic reticulum
D) Cilia
E) Nucleolus
✓ CORRECT ANSWER: A) Centrosome
RATIONALE: The centrosome, containing a pair of centrioles, serves as the main
microtubule organizing center (MTOC) in animal cells. It plays a critical role in
organizing the spindle fibers during cell division. Ribosomes synthesize proteins,
the ER synthesizes membrane and secreted proteins, cilia are motile structures,
and the nucleolus produces ribosomal RNA.
7. What is the function of the smooth endoplasmic reticulum?
A) Synthesis of proteins destined for secretion
B) Synthesis of lipids and carbohydrates; detoxification of harmful substances
C) Storage of calcium ions and synthesis of ATP
D) Transport of proteins to the Golgi apparatus only
