Biology Exam 200 Questions with
Answers Latest Update
EXAM
1. Which organelle is responsible for cellular respiration?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Answer: C) Mitochondrion
Rationale: Mitochondria generate ATP through the process of cellular respiration. The
nucleus holds DNA, ribosomes synthesize proteins, and the Golgi modifies and packages
proteins.
2. What is the primary function of the ribosome?
A) Lipid synthesis
B) Protein synthesis
C) DNA replication
D) Energy production
Answer: B) Protein synthesis
Rationale: Ribosomes read mRNA and assemble amino acids into polypeptide chains.
3. Which structure is found in plant cells but not in animal cells?
A) Cell membrane
B) Nucleus
C) Cell wall
D) Cytoplasm
Answer: C) Cell wall
,Rationale: Plant cells have a rigid cellulose cell wall for structural support; animal cells
lack this structure.
4. The fluid mosaic model describes the structure of the:
A) Cell wall
B) Plasma membrane
C) Nucleus
D) Cytoskeleton
Answer: B) Plasma membrane
Rationale: The model describes the phospholipid bilayer with embedded proteins that
move laterally.
5. Which organelle contains hydrolytic enzymes for digestion?
A) Peroxisome
B) Lysosome
C) Vacuole
D) Endoplasmic reticulum
Answer: B) Lysosome
Rationale: Lysosomes break down waste, foreign materials, and old organelles using
hydrolytic enzymes.
6. What is the role of the Golgi apparatus?
A) Synthesize ATP
B) Store genetic material
C) Modify, sort, and package proteins
D) Conduct photosynthesis
Answer: C) Modify, sort, and package proteins
Rationale: The Golgi modifies proteins from the ER and packages them into vesicles for
transport.
7. Prokaryotic cells lack:
A) Ribosomes
B) A cell membrane
,C) A nucleus
D) Cytoplasm
Answer: C) A nucleus
Rationale: Prokaryotes have a nucleoid region with free-floating DNA, not a membrane-
bound nucleus.
8. Which organelle is the site of photosynthesis?
A) Chloroplast
B) Mitochondria
C) Nucleus
D) Ribosome
Answer: A) Chloroplast
Rationale: Chloroplasts contain chlorophyll and convert light energy into chemical energy
(glucose).
9. The cytoskeleton is composed of:
A) Microtubules and microfilaments
B) Lipids and carbohydrates
C) DNA and RNA
D) Enzymes and hormones
Answer: A) Microtubules and microfilaments
Rationale: These protein filaments provide structural support and facilitate cell movement
and division.
10. What is the function of the smooth endoplasmic reticulum?
A) Protein synthesis
B) Lipid synthesis and detoxification
C) ATP production
D) Photosynthesis
Answer: B) Lipid synthesis and detoxification
Rationale: The smooth ER synthesizes lipids, phospholipids, and steroids, and helps
detoxify chemicals.
, 11. Which of the following is a characteristic of active transport?
A) Movement down a concentration gradient
B) Requires ATP
C) Does not require a protein channel
D) Includes osmosis
Answer: B) Requires ATP
Rationale: Active transport moves substances against their gradient using energy (ATP).
12. The nucleolus is responsible for producing:
A) mRNA
B) tRNA
C) Ribosomal RNA (rRNA)
D) DNA
Answer: C) Ribosomal RNA (rRNA)
Rationale: The nucleolus is where rRNA is synthesized and ribosome subunits are
assembled.
13. A cell placed in a hypertonic solution will:
A) Swell and burst
B) Shrivel (crenation)
C) Remain unchanged
D) Undergo photosynthesis
Answer: B) Shrivel (crenation)
Rationale: Water moves out of the cell into the higher solute concentration outside,
causing shrinkage.
14. Which organelle is involved in the process of autophagy?
A) Nucleus
B) Lysosome
C) Ribosome
Answers Latest Update
EXAM
1. Which organelle is responsible for cellular respiration?
A) Nucleus
B) Ribosome
C) Mitochondrion
D) Golgi apparatus
Answer: C) Mitochondrion
Rationale: Mitochondria generate ATP through the process of cellular respiration. The
nucleus holds DNA, ribosomes synthesize proteins, and the Golgi modifies and packages
proteins.
2. What is the primary function of the ribosome?
A) Lipid synthesis
B) Protein synthesis
C) DNA replication
D) Energy production
Answer: B) Protein synthesis
Rationale: Ribosomes read mRNA and assemble amino acids into polypeptide chains.
3. Which structure is found in plant cells but not in animal cells?
A) Cell membrane
B) Nucleus
C) Cell wall
D) Cytoplasm
Answer: C) Cell wall
,Rationale: Plant cells have a rigid cellulose cell wall for structural support; animal cells
lack this structure.
4. The fluid mosaic model describes the structure of the:
A) Cell wall
B) Plasma membrane
C) Nucleus
D) Cytoskeleton
Answer: B) Plasma membrane
Rationale: The model describes the phospholipid bilayer with embedded proteins that
move laterally.
5. Which organelle contains hydrolytic enzymes for digestion?
A) Peroxisome
B) Lysosome
C) Vacuole
D) Endoplasmic reticulum
Answer: B) Lysosome
Rationale: Lysosomes break down waste, foreign materials, and old organelles using
hydrolytic enzymes.
6. What is the role of the Golgi apparatus?
A) Synthesize ATP
B) Store genetic material
C) Modify, sort, and package proteins
D) Conduct photosynthesis
Answer: C) Modify, sort, and package proteins
Rationale: The Golgi modifies proteins from the ER and packages them into vesicles for
transport.
7. Prokaryotic cells lack:
A) Ribosomes
B) A cell membrane
,C) A nucleus
D) Cytoplasm
Answer: C) A nucleus
Rationale: Prokaryotes have a nucleoid region with free-floating DNA, not a membrane-
bound nucleus.
8. Which organelle is the site of photosynthesis?
A) Chloroplast
B) Mitochondria
C) Nucleus
D) Ribosome
Answer: A) Chloroplast
Rationale: Chloroplasts contain chlorophyll and convert light energy into chemical energy
(glucose).
9. The cytoskeleton is composed of:
A) Microtubules and microfilaments
B) Lipids and carbohydrates
C) DNA and RNA
D) Enzymes and hormones
Answer: A) Microtubules and microfilaments
Rationale: These protein filaments provide structural support and facilitate cell movement
and division.
10. What is the function of the smooth endoplasmic reticulum?
A) Protein synthesis
B) Lipid synthesis and detoxification
C) ATP production
D) Photosynthesis
Answer: B) Lipid synthesis and detoxification
Rationale: The smooth ER synthesizes lipids, phospholipids, and steroids, and helps
detoxify chemicals.
, 11. Which of the following is a characteristic of active transport?
A) Movement down a concentration gradient
B) Requires ATP
C) Does not require a protein channel
D) Includes osmosis
Answer: B) Requires ATP
Rationale: Active transport moves substances against their gradient using energy (ATP).
12. The nucleolus is responsible for producing:
A) mRNA
B) tRNA
C) Ribosomal RNA (rRNA)
D) DNA
Answer: C) Ribosomal RNA (rRNA)
Rationale: The nucleolus is where rRNA is synthesized and ribosome subunits are
assembled.
13. A cell placed in a hypertonic solution will:
A) Swell and burst
B) Shrivel (crenation)
C) Remain unchanged
D) Undergo photosynthesis
Answer: B) Shrivel (crenation)
Rationale: Water moves out of the cell into the higher solute concentration outside,
causing shrinkage.
14. Which organelle is involved in the process of autophagy?
A) Nucleus
B) Lysosome
C) Ribosome
