+20 Questions on the Cell Membrane
20 multiple choice questions on the Cell Membrane, with answers at the end.
Multiple Choice Questions: Cell Membrane
1. What is the primary function of the cell membrane?
A) Protein synthesis
B) Controlling what enters and leaves the cell
C) Energy production
D) DNA storage
2. The cell membrane is mainly composed of:
A) Proteins and carbohydrates
B) Lipids and proteins
C) Nucleic acids and lipids
D) Carbohydrates and nucleic acids
3. What type of lipid is most abundant in the cell membrane?
A) Triglycerides
B) Phospholipids
C) Steroids
D) Waxes
4. The term "fluid mosaic model" refers to:
A) The rigid structure of the membrane
B) The membrane is made of a fixed pattern of lipids
C) The membrane is flexible with proteins embedded in a lipid bilayer
D) The membrane is made of carbohydrates only
5. Which part of the phospholipid faces the inside of the cell membrane?
A) Hydrophobic tails
B) Hydrophilic heads
C) Both face inside
D) Neither
6. Which molecules help transport substances across the cell membrane?
A) DNA
B) Proteins
C) Carbohydrates
D) RNA
7. Which of the following is NOT a function of membrane proteins?
A) Transport
B) Enzymatic activity
C) Genetic coding
D) Cell signaling
8. The carbohydrate chains attached to proteins or lipids on the membrane surface are involved in:
A) Energy storage
B) Cell recognition and signaling
C) Structural support
D) Transport of molecules
9. What is selective permeability?
A) The membrane allows all substances to pass freely
B) The membrane allows only some substances to pass through
C) The membrane is impermeable to all substances
D) The membrane allows only water to pass
10. Which of these molecules can easily pass through the cell membrane without assistance?
A) Large proteins
B) Ions
C) Small nonpolar molecules like oxygen and carbon dioxide
D) Glucose
11. Which process requires energy to move substances across the membrane?
A) Diffusion
B) Osmosis
C) Facilitated diffusion
D) Active transport
12. Osmosis is the movement of:
A) Ions across the membrane
B) Water across a selectively permeable membrane
C) Proteins through a channel
D) Oxygen into the cell
13. What structure helps maintain the cell membrane's fluidity?
A) Cholesterol
B) Glycoproteins
C) Phospholipids
D) Cytoskeleton
14. Endocytosis and exocytosis are processes that involve:
A) Passive transport
B) Active transport of large molecules via vesicles
C) Diffusion
D) Osmosis
15. Which of the following is NOT part of the cell membrane?
A) Phospholipid bilayer
B) Ribosomes
C) Integral proteins
D) Glycolipids
16. Which membrane protein spans the entire membrane and helps transport molecules?
A) Peripheral protein
B) Integral protein
C) Enzymatic protein
D) Structural protein
17. Facilitated diffusion requires:
A) Energy
B) Carrier proteins or channels
C) ATP
D) Vesicles
18. What type of transport moves molecules from low to high concentration?
A) Passive transport
B) Active transport
C) Diffusion
D) Osmosis
19. Which of these is a function of glycoproteins on the cell membrane?
A) Energy storage
B) Cell-to-cell recognition
C) Structural support
D) Protein synthesis
20. The outer surface of the cell membrane is mostly:
A) Hydrophobic
B) Hydrophilic
C) Nonpolar
D) Fatty acid tails
Answer Key
1. B) Controlling what enters and leaves the cell
2. B) Lipids and proteins
3. B) Phospholipids
4. C) The membrane is flexible with proteins embedded in a lipid bilayer
5. B) Hydrophilic heads
6. B) Proteins
7. C) Genetic coding
8. B) Cell recognition and signaling
9. B) The membrane allows only some substances to pass through
10. C) Small nonpolar molecules like oxygen and carbon dioxide
11. D) Active transport
12. B) Water across a selectively permeable membrane
13. A) Cholesterol
14. B) Active transport of large molecules via vesicles
15. B) Ribosomes
16. B) Integral protein
17. B) Carrier proteins or channels
18. B) Active transport
19. B) Cell-to-cell recognition
20. B) Hydrophilic
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