BIO 101 Final Exam Practice — Questions
1–100
2026–2027 Study Guide
Cell Biology
1. Which structure is considered the basic unit of life?
A. Tissue
B. Organ
C. Cell
D. Organ system
Answer: C. Cell
Rationale: The cell is the smallest structural and functional unit capable of carrying out the
processes associated with life.
2. Which organelle contains most of a eukaryotic cell's DNA?
A. Ribosome
B. Nucleus
C. Lysosome
D. Golgi apparatus
Answer: B. Nucleus
Rationale: The nucleus houses the chromosomes containing most of the cell's genetic material.
3. Which organelle is the primary site of ATP production during aerobic respiration?
A. Chloroplast
B. Mitochondrion
C. Nucleus
D. Vacuole
Answer: B. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through oxidative phosphorylation.
,4. What is the primary function of ribosomes?
A. DNA replication
B. Lipid storage
C. Protein synthesis
D. ATP storage
Answer: C. Protein synthesis
Rationale: Ribosomes translate messenger RNA into polypeptide chains.
5. Which organelle modifies, sorts, and packages proteins?
A. Golgi apparatus
B. Nucleus
C. Mitochondrion
D. Lysosome
Answer: A. Golgi apparatus
Rationale: The Golgi receives proteins from the endoplasmic reticulum, modifies them, and
directs them to appropriate destinations.
6. Which organelle contains enzymes that digest cellular waste and worn-out structures?
A. Ribosome
B. Lysosome
C. Nucleolus
D. Centriole
Answer: B. Lysosome
Rationale: Lysosomes contain hydrolytic enzymes that break down macromolecules and cellular
debris.
7. Which structure controls what enters and leaves the cell?
A. Cell membrane
B. Nucleolus
C. Chromosome
D. Cytoskeleton
Answer: A. Cell membrane
Rationale: The plasma membrane is selectively permeable and regulates movement of
substances between the cell and its environment.
, 8. Which characteristic is unique to prokaryotic cells?
A. They contain DNA
B. They contain ribosomes
C. They lack a membrane-bound nucleus
D. They have cytoplasm
Answer: C. They lack a membrane-bound nucleus
Rationale: Prokaryotes, including bacteria and archaea, do not have a membrane-enclosed
nucleus.
9. Which structure is found in plant cells but not typical animal cells?
A. Mitochondrion
B. Ribosome
C. Chloroplast
D. Plasma membrane
Answer: C. Chloroplast
Rationale: Chloroplasts carry out photosynthesis and are characteristic of plants and many
algae.
10. Which cellular structure provides support and helps maintain cell shape?
A. Cytoskeleton
B. Nucleolus
C. Lysosome
D. Golgi apparatus
Answer: A. Cytoskeleton
Rationale: The cytoskeleton consists of protein filaments that maintain cell shape, organize
organelles, and participate in cellular movement.
Biological Molecules
11. Which elements are found in all carbohydrates?
A. Carbon, hydrogen, and oxygen
B. Nitrogen and phosphorus only
C. Carbon and nitrogen only
D. Calcium and oxygen
1–100
2026–2027 Study Guide
Cell Biology
1. Which structure is considered the basic unit of life?
A. Tissue
B. Organ
C. Cell
D. Organ system
Answer: C. Cell
Rationale: The cell is the smallest structural and functional unit capable of carrying out the
processes associated with life.
2. Which organelle contains most of a eukaryotic cell's DNA?
A. Ribosome
B. Nucleus
C. Lysosome
D. Golgi apparatus
Answer: B. Nucleus
Rationale: The nucleus houses the chromosomes containing most of the cell's genetic material.
3. Which organelle is the primary site of ATP production during aerobic respiration?
A. Chloroplast
B. Mitochondrion
C. Nucleus
D. Vacuole
Answer: B. Mitochondrion
Rationale: Mitochondria generate most cellular ATP through oxidative phosphorylation.
,4. What is the primary function of ribosomes?
A. DNA replication
B. Lipid storage
C. Protein synthesis
D. ATP storage
Answer: C. Protein synthesis
Rationale: Ribosomes translate messenger RNA into polypeptide chains.
5. Which organelle modifies, sorts, and packages proteins?
A. Golgi apparatus
B. Nucleus
C. Mitochondrion
D. Lysosome
Answer: A. Golgi apparatus
Rationale: The Golgi receives proteins from the endoplasmic reticulum, modifies them, and
directs them to appropriate destinations.
6. Which organelle contains enzymes that digest cellular waste and worn-out structures?
A. Ribosome
B. Lysosome
C. Nucleolus
D. Centriole
Answer: B. Lysosome
Rationale: Lysosomes contain hydrolytic enzymes that break down macromolecules and cellular
debris.
7. Which structure controls what enters and leaves the cell?
A. Cell membrane
B. Nucleolus
C. Chromosome
D. Cytoskeleton
Answer: A. Cell membrane
Rationale: The plasma membrane is selectively permeable and regulates movement of
substances between the cell and its environment.
, 8. Which characteristic is unique to prokaryotic cells?
A. They contain DNA
B. They contain ribosomes
C. They lack a membrane-bound nucleus
D. They have cytoplasm
Answer: C. They lack a membrane-bound nucleus
Rationale: Prokaryotes, including bacteria and archaea, do not have a membrane-enclosed
nucleus.
9. Which structure is found in plant cells but not typical animal cells?
A. Mitochondrion
B. Ribosome
C. Chloroplast
D. Plasma membrane
Answer: C. Chloroplast
Rationale: Chloroplasts carry out photosynthesis and are characteristic of plants and many
algae.
10. Which cellular structure provides support and helps maintain cell shape?
A. Cytoskeleton
B. Nucleolus
C. Lysosome
D. Golgi apparatus
Answer: A. Cytoskeleton
Rationale: The cytoskeleton consists of protein filaments that maintain cell shape, organize
organelles, and participate in cellular movement.
Biological Molecules
11. Which elements are found in all carbohydrates?
A. Carbon, hydrogen, and oxygen
B. Nitrogen and phosphorus only
C. Carbon and nitrogen only
D. Calcium and oxygen
