Membrane Structure (Fluid
Mosaic Model) Exam- 2025
2026[Complete Exam prep
Questions with verified
Answers] 100%Correct
Answers
1. What is the primary structural component of the cell
membrane?
A. Proteins
B. Nucleic acids
C. Phospholipids
D. Carbohydrates
Answer: C. Phospholipids
Rationale: The cell membrane is primarily composed of a
phospholipid bilayer that forms the basic structural
framework.
2. The Fluid Mosaic Model was proposed by:
A. Watson and Crick
B. Singer and Nicolson
,C. Schleiden and Schwann
D. Hooke and Leeuwenhoek
Answer: B. Singer and Nicolson
Rationale: Singer and Nicolson proposed the Fluid Mosaic
Model in 1972.
3. In a phospholipid, the phosphate head is:
A. Hydrophobic
B. Nonpolar
C. Hydrophilic
D. Neutral
Answer: C. Hydrophilic
Rationale: The phosphate group is polar and interacts
readily with water.
4. The fatty acid tails of phospholipids are:
A. Hydrophilic
B. Polar
C. Charged
D. Hydrophobic
Answer: D. Hydrophobic
Rationale: Fatty acid tails are nonpolar and repel water.
5. The term "fluid" in the Fluid Mosaic Model refers to:
,A. Water inside the cell
B. Movement of membrane components
C. Cytoplasm flow
D. Blood circulation
Answer: B. Movement of membrane components
Rationale: Lipids and many proteins can move laterally
within the membrane.
6. The term "mosaic" refers to:
A. Presence of water molecules
B. Double membrane layers
C. Variety of proteins embedded in the membrane
D. Cell wall arrangement
Answer: C. Variety of proteins embedded in the membrane
Rationale: The membrane contains diverse proteins
arranged like a mosaic.
7. Which molecule helps stabilize membrane fluidity in
animal cells?
A. DNA
B. ATP
C. Cholesterol
D. Glycogen
Answer: C. Cholesterol
, Rationale: Cholesterol regulates membrane fluidity under
varying temperatures.
8. Membrane proteins that span the entire bilayer are
called:
A. Peripheral proteins
B. Integral proteins
C. Enzymes
D. Glycolipids
Answer: B. Integral proteins
Rationale: Integral proteins are embedded within and often
cross the membrane.
9. Proteins attached only to the membrane surface are:
A. Integral proteins
B. Transport proteins
C. Peripheral proteins
D. Channel proteins
Answer: C. Peripheral proteins
Rationale: Peripheral proteins are loosely attached to the
membrane surface.
10. The phospholipid bilayer forms because phospholipids
are:
Mosaic Model) Exam- 2025
2026[Complete Exam prep
Questions with verified
Answers] 100%Correct
Answers
1. What is the primary structural component of the cell
membrane?
A. Proteins
B. Nucleic acids
C. Phospholipids
D. Carbohydrates
Answer: C. Phospholipids
Rationale: The cell membrane is primarily composed of a
phospholipid bilayer that forms the basic structural
framework.
2. The Fluid Mosaic Model was proposed by:
A. Watson and Crick
B. Singer and Nicolson
,C. Schleiden and Schwann
D. Hooke and Leeuwenhoek
Answer: B. Singer and Nicolson
Rationale: Singer and Nicolson proposed the Fluid Mosaic
Model in 1972.
3. In a phospholipid, the phosphate head is:
A. Hydrophobic
B. Nonpolar
C. Hydrophilic
D. Neutral
Answer: C. Hydrophilic
Rationale: The phosphate group is polar and interacts
readily with water.
4. The fatty acid tails of phospholipids are:
A. Hydrophilic
B. Polar
C. Charged
D. Hydrophobic
Answer: D. Hydrophobic
Rationale: Fatty acid tails are nonpolar and repel water.
5. The term "fluid" in the Fluid Mosaic Model refers to:
,A. Water inside the cell
B. Movement of membrane components
C. Cytoplasm flow
D. Blood circulation
Answer: B. Movement of membrane components
Rationale: Lipids and many proteins can move laterally
within the membrane.
6. The term "mosaic" refers to:
A. Presence of water molecules
B. Double membrane layers
C. Variety of proteins embedded in the membrane
D. Cell wall arrangement
Answer: C. Variety of proteins embedded in the membrane
Rationale: The membrane contains diverse proteins
arranged like a mosaic.
7. Which molecule helps stabilize membrane fluidity in
animal cells?
A. DNA
B. ATP
C. Cholesterol
D. Glycogen
Answer: C. Cholesterol
, Rationale: Cholesterol regulates membrane fluidity under
varying temperatures.
8. Membrane proteins that span the entire bilayer are
called:
A. Peripheral proteins
B. Integral proteins
C. Enzymes
D. Glycolipids
Answer: B. Integral proteins
Rationale: Integral proteins are embedded within and often
cross the membrane.
9. Proteins attached only to the membrane surface are:
A. Integral proteins
B. Transport proteins
C. Peripheral proteins
D. Channel proteins
Answer: C. Peripheral proteins
Rationale: Peripheral proteins are loosely attached to the
membrane surface.
10. The phospholipid bilayer forms because phospholipids
are:
