TExES Life Science 7–12 Certification
Examination Questions and Correct
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Rationales 2026 Q&A | Instant
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Question 1
The basic structural and functional unit of life is the:
A. Tissue
B. Organ
C. Organ system
D. Cell
Answer: D. Cell
Rationale: Cells are the smallest units capable of carrying out all essential life
processes and form the foundation of all living organisms.
Question 2
Which organelle contains the genetic material in a eukaryotic cell?
A. Ribosome
B. Mitochondrion
C. Golgi apparatus
D. Nucleus
Answer: D. Nucleus
,Rationale: The nucleus stores DNA and controls many cellular activities in
eukaryotic cells.
Question 3
Which organelle is responsible for producing most ATP in animal cells?
A. Lysosome
B. Chloroplast
C. Nucleus
D. Mitochondrion
Answer: D. Mitochondrion
Rationale: Mitochondria generate ATP through cellular respiration.
Question 4
Ribosomes are responsible for:
A. DNA replication
B. Lipid storage
C. Waste removal
D. Protein synthesis
Answer: D. Protein synthesis
Rationale: Ribosomes translate messenger RNA into proteins by linking amino
acids together.
Question 5
The cell membrane is primarily composed of:
A. Cellulose and proteins
B. DNA and RNA
C. Starch and lipids
D. Phospholipids and proteins
,Answer: D. Phospholipids and proteins
Rationale: The phospholipid bilayer with embedded proteins forms the selectively
permeable cell membrane.
Question 6
The movement of molecules from high concentration to low concentration is:
A. Active transport
B. Endocytosis
C. Exocytosis
D. Diffusion
Answer: D. Diffusion
Rationale: Diffusion is passive movement down a concentration gradient.
Question 7
Osmosis is the movement of:
A. Proteins
B. Glucose
C. Oxygen
D. Water
Answer: D. Water
Rationale: Osmosis specifically refers to water movement across a selectively
permeable membrane.
Question 8
Active transport requires:
A. Oxygen only
B. Carbon dioxide
, C. Light energy
D. Cellular energy (ATP)
Answer: D. Cellular energy (ATP)
Rationale: Active transport moves substances against concentration gradients and
requires energy.
Question 9
Photosynthesis occurs in which organelle?
A. Nucleus
B. Ribosome
C. Mitochondrion
D. Chloroplast
Answer: D. Chloroplast
Rationale: Chloroplasts contain chlorophyll, which captures light energy for
photosynthesis.
Question 10
The pigment that absorbs light energy during photosynthesis is:
A. Hemoglobin
B. Melanin
C. Keratin
D. Chlorophyll
Answer: D. Chlorophyll
Rationale: Chlorophyll absorbs light energy needed to produce glucose.
Question 11
The main products of photosynthesis are:
Examination Questions and Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
The basic structural and functional unit of life is the:
A. Tissue
B. Organ
C. Organ system
D. Cell
Answer: D. Cell
Rationale: Cells are the smallest units capable of carrying out all essential life
processes and form the foundation of all living organisms.
Question 2
Which organelle contains the genetic material in a eukaryotic cell?
A. Ribosome
B. Mitochondrion
C. Golgi apparatus
D. Nucleus
Answer: D. Nucleus
,Rationale: The nucleus stores DNA and controls many cellular activities in
eukaryotic cells.
Question 3
Which organelle is responsible for producing most ATP in animal cells?
A. Lysosome
B. Chloroplast
C. Nucleus
D. Mitochondrion
Answer: D. Mitochondrion
Rationale: Mitochondria generate ATP through cellular respiration.
Question 4
Ribosomes are responsible for:
A. DNA replication
B. Lipid storage
C. Waste removal
D. Protein synthesis
Answer: D. Protein synthesis
Rationale: Ribosomes translate messenger RNA into proteins by linking amino
acids together.
Question 5
The cell membrane is primarily composed of:
A. Cellulose and proteins
B. DNA and RNA
C. Starch and lipids
D. Phospholipids and proteins
,Answer: D. Phospholipids and proteins
Rationale: The phospholipid bilayer with embedded proteins forms the selectively
permeable cell membrane.
Question 6
The movement of molecules from high concentration to low concentration is:
A. Active transport
B. Endocytosis
C. Exocytosis
D. Diffusion
Answer: D. Diffusion
Rationale: Diffusion is passive movement down a concentration gradient.
Question 7
Osmosis is the movement of:
A. Proteins
B. Glucose
C. Oxygen
D. Water
Answer: D. Water
Rationale: Osmosis specifically refers to water movement across a selectively
permeable membrane.
Question 8
Active transport requires:
A. Oxygen only
B. Carbon dioxide
, C. Light energy
D. Cellular energy (ATP)
Answer: D. Cellular energy (ATP)
Rationale: Active transport moves substances against concentration gradients and
requires energy.
Question 9
Photosynthesis occurs in which organelle?
A. Nucleus
B. Ribosome
C. Mitochondrion
D. Chloroplast
Answer: D. Chloroplast
Rationale: Chloroplasts contain chlorophyll, which captures light energy for
photosynthesis.
Question 10
The pigment that absorbs light energy during photosynthesis is:
A. Hemoglobin
B. Melanin
C. Keratin
D. Chlorophyll
Answer: D. Chlorophyll
Rationale: Chlorophyll absorbs light energy needed to produce glucose.
Question 11
The main products of photosynthesis are:
