BIO 201 FINAL EXAM STUDY GUIDE | PRINCIPLES OF
CELL & MOLECULAR BIOLOGY | COMPREHENSIVE
PRACTICE QUESTIONS & ANSWERS | UNIVERSITY
EXAM PREP
SECTION A: CELL BIOLOGY AND BIOCHEMISTRY (Questions 1 - 250)
1. The primary structural component of the plant cell wall is:
A. Chitin
B. Cellulose
C. Peptidoglycan
D. Lignin
Answer: B. Cellulose
Rationale: Cellulose is a polysaccharide composed of β-glucose units forming the
rigid framework of plant cell walls.
2. Which of the following organelles is responsible for the synthesis of lipids and
detoxification of drugs?
A. Rough Endoplasmic Reticulum
B. Smooth Endoplasmic Reticulum
C. Golgi Apparatus
D. Mitochondria
Answer: B. Smooth Endoplasmic Reticulum
Rationale: The smooth ER lacks ribosomes and is involved in lipid synthesis,
carbohydrate metabolism, and detoxification.
3. The fluid mosaic model describes the plasma membrane as:
A. A static, rigid layer of phospholipids and proteins.
B. A bilayer of phospholipids in which proteins are embedded and can move
laterally.
, C. A single layer of phospholipids with proteins attached to the surface.
D. A mosaic of carbohydrates and nucleic acids.
Answer: B. A bilayer of phospholipids in which proteins are embedded and can
move laterally.
Rationale: The fluid mosaic model emphasizes the dynamic nature of the
membrane, with phospholipids and proteins moving within the bilayer.
4. Which of the following is a characteristic of prokaryotic cells but NOT eukaryotic
cells?
A. Ribosomes
B. Cell membrane
C. Nucleoid region
D. Cytoplasm
Answer: C. Nucleoid region
Rationale: Prokaryotes lack a membrane-bound nucleus; their DNA is concentrated
in a region called the nucleoid.
5. The organelle that contains hydrolytic enzymes for intracellular digestion is the:
A. Peroxisome
B. Lysosome
C. Vacuole
D. Ribosome
Answer: B. Lysosome
Rationale: Lysosomes are the cell's "garbage disposal" system, containing acid
hydrolases for breaking down macromolecules.
6. Mitochondria are the site of:
A. Glycolysis
B. The Krebs Cycle and Oxidative Phosphorylation
C. Photosynthesis
D. Protein Synthesis
Answer: B. The Krebs Cycle and Oxidative Phosphorylation
Rationale: Mitochondria house the enzymes for the Krebs cycle in the matrix and the
electron transport chain in the inner membrane.
7. The process by which cells ingest large particles or microorganisms is called:
A. Pinocytosis
B. Receptor-mediated endocytosis
C. Phagocytosis
D. Exocytosis
, Answer: C. Phagocytosis
Rationale: Phagocytosis, or "cell eating," is the engulfment of large particles by the
plasma membrane.
8. The function of the Golgi apparatus is to:
A. Synthesize ATP.
B. Synthesize ribosomal RNA.
C. Modify, sort, and package proteins for secretion.
D. Produce lipids.
Answer: C. Modify, sort, and package proteins for secretion.
Rationale: The Golgi apparatus receives proteins from the ER, modifies them, and
packages them into vesicles for transport.
9. Which of the following is NOT a component of the cytoskeleton?
A. Microtubules
B. Microfilaments
C. Intermediate filaments
D. Centrioles
Answer: D. Centrioles
Rationale: Centrioles are involved in cell division but are not a primary component of
the cytoskeleton, which consists of microtubules, microfilaments, and intermediate
filaments.
10. Diffusion is the movement of molecules from:
A. An area of low concentration to an area of high concentration.
B. An area of high concentration to an area of low concentration.
C. An area of high concentration to an area of equal concentration.
D. An area of low concentration to an area of lower concentration.
Answer: B. An area of high concentration to an area of low concentration.
Rationale: Diffusion is the passive movement of molecules down their
concentration gradient.
11. The sodium-potassium pump is an example of:
A. Simple diffusion
B. Facilitated diffusion
C. Active transport
D. Osmosis
Answer: C. Active transport
Rationale: The pump uses ATP to move Na+ and K+ against their concentration
gradients.
, 12. Ribosomes are composed of:
A. DNA and protein
B. RNA and protein
C. RNA and lipids
D. Protein and carbohydrates
Answer: B. RNA and protein
Rationale: Ribosomes have a large and small subunit, each made of ribosomal RNA
(rRNA) and associated proteins.
13. The cell theory states that:
A. All cells have a nucleus.
B. Cells arise spontaneously from non-living matter.
C. All living things are composed of cells and all cells come from pre-existing cells.
D. Cells are the smallest unit of life.
Answer: C. All living things are composed of cells and all cells come from pre-
existing cells.
Rationale: The cell theory's three main tenets are: all organisms are made of cells,
cells are the basic unit of life, and cells arise from pre-existing cells.
14. The primary function of the nucleolus is:
A. DNA replication
B. Transcription of mRNA
C. Ribosomal RNA synthesis and ribosome assembly
D. Protein synthesis
Answer: C. Ribosomal RNA synthesis and ribosome assembly
Rationale: The nucleolus is a dense region within the nucleus where rRNA is
transcribed and ribosomes are assembled.
15. Which of the following molecules is found in the plasma membrane and contributes
to its fluidity?
A. Proteins
B. Glycoproteins
C. Cholesterol
D. Glycolipids
Answer: C. Cholesterol
Rationale: Cholesterol molecules are embedded within the phospholipid bilayer and
help modulate membrane fluidity.
16. The endomembrane system includes all of the following EXCEPT:
A. The nuclear envelope
CELL & MOLECULAR BIOLOGY | COMPREHENSIVE
PRACTICE QUESTIONS & ANSWERS | UNIVERSITY
EXAM PREP
SECTION A: CELL BIOLOGY AND BIOCHEMISTRY (Questions 1 - 250)
1. The primary structural component of the plant cell wall is:
A. Chitin
B. Cellulose
C. Peptidoglycan
D. Lignin
Answer: B. Cellulose
Rationale: Cellulose is a polysaccharide composed of β-glucose units forming the
rigid framework of plant cell walls.
2. Which of the following organelles is responsible for the synthesis of lipids and
detoxification of drugs?
A. Rough Endoplasmic Reticulum
B. Smooth Endoplasmic Reticulum
C. Golgi Apparatus
D. Mitochondria
Answer: B. Smooth Endoplasmic Reticulum
Rationale: The smooth ER lacks ribosomes and is involved in lipid synthesis,
carbohydrate metabolism, and detoxification.
3. The fluid mosaic model describes the plasma membrane as:
A. A static, rigid layer of phospholipids and proteins.
B. A bilayer of phospholipids in which proteins are embedded and can move
laterally.
, C. A single layer of phospholipids with proteins attached to the surface.
D. A mosaic of carbohydrates and nucleic acids.
Answer: B. A bilayer of phospholipids in which proteins are embedded and can
move laterally.
Rationale: The fluid mosaic model emphasizes the dynamic nature of the
membrane, with phospholipids and proteins moving within the bilayer.
4. Which of the following is a characteristic of prokaryotic cells but NOT eukaryotic
cells?
A. Ribosomes
B. Cell membrane
C. Nucleoid region
D. Cytoplasm
Answer: C. Nucleoid region
Rationale: Prokaryotes lack a membrane-bound nucleus; their DNA is concentrated
in a region called the nucleoid.
5. The organelle that contains hydrolytic enzymes for intracellular digestion is the:
A. Peroxisome
B. Lysosome
C. Vacuole
D. Ribosome
Answer: B. Lysosome
Rationale: Lysosomes are the cell's "garbage disposal" system, containing acid
hydrolases for breaking down macromolecules.
6. Mitochondria are the site of:
A. Glycolysis
B. The Krebs Cycle and Oxidative Phosphorylation
C. Photosynthesis
D. Protein Synthesis
Answer: B. The Krebs Cycle and Oxidative Phosphorylation
Rationale: Mitochondria house the enzymes for the Krebs cycle in the matrix and the
electron transport chain in the inner membrane.
7. The process by which cells ingest large particles or microorganisms is called:
A. Pinocytosis
B. Receptor-mediated endocytosis
C. Phagocytosis
D. Exocytosis
, Answer: C. Phagocytosis
Rationale: Phagocytosis, or "cell eating," is the engulfment of large particles by the
plasma membrane.
8. The function of the Golgi apparatus is to:
A. Synthesize ATP.
B. Synthesize ribosomal RNA.
C. Modify, sort, and package proteins for secretion.
D. Produce lipids.
Answer: C. Modify, sort, and package proteins for secretion.
Rationale: The Golgi apparatus receives proteins from the ER, modifies them, and
packages them into vesicles for transport.
9. Which of the following is NOT a component of the cytoskeleton?
A. Microtubules
B. Microfilaments
C. Intermediate filaments
D. Centrioles
Answer: D. Centrioles
Rationale: Centrioles are involved in cell division but are not a primary component of
the cytoskeleton, which consists of microtubules, microfilaments, and intermediate
filaments.
10. Diffusion is the movement of molecules from:
A. An area of low concentration to an area of high concentration.
B. An area of high concentration to an area of low concentration.
C. An area of high concentration to an area of equal concentration.
D. An area of low concentration to an area of lower concentration.
Answer: B. An area of high concentration to an area of low concentration.
Rationale: Diffusion is the passive movement of molecules down their
concentration gradient.
11. The sodium-potassium pump is an example of:
A. Simple diffusion
B. Facilitated diffusion
C. Active transport
D. Osmosis
Answer: C. Active transport
Rationale: The pump uses ATP to move Na+ and K+ against their concentration
gradients.
, 12. Ribosomes are composed of:
A. DNA and protein
B. RNA and protein
C. RNA and lipids
D. Protein and carbohydrates
Answer: B. RNA and protein
Rationale: Ribosomes have a large and small subunit, each made of ribosomal RNA
(rRNA) and associated proteins.
13. The cell theory states that:
A. All cells have a nucleus.
B. Cells arise spontaneously from non-living matter.
C. All living things are composed of cells and all cells come from pre-existing cells.
D. Cells are the smallest unit of life.
Answer: C. All living things are composed of cells and all cells come from pre-
existing cells.
Rationale: The cell theory's three main tenets are: all organisms are made of cells,
cells are the basic unit of life, and cells arise from pre-existing cells.
14. The primary function of the nucleolus is:
A. DNA replication
B. Transcription of mRNA
C. Ribosomal RNA synthesis and ribosome assembly
D. Protein synthesis
Answer: C. Ribosomal RNA synthesis and ribosome assembly
Rationale: The nucleolus is a dense region within the nucleus where rRNA is
transcribed and ribosomes are assembled.
15. Which of the following molecules is found in the plasma membrane and contributes
to its fluidity?
A. Proteins
B. Glycoproteins
C. Cholesterol
D. Glycolipids
Answer: C. Cholesterol
Rationale: Cholesterol molecules are embedded within the phospholipid bilayer and
help modulate membrane fluidity.
16. The endomembrane system includes all of the following EXCEPT:
A. The nuclear envelope
