What is the basic structure of all cell membranes, including cell-surface membranes and the membranes around cell organelles of eukaryotes?
3.2.3 Cell Membrane Structure

Quiz
•
Biology
•
11th Grade
•
Easy

Ross Kearns
Used 1+ times
FREE Resource
8 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Double helix
Fluid-mosaic model
Solid matrix
Crystal lattice
Answer explanation
The fluid-mosaic model describes the structure of all cell membranes, including cell-surface membranes and organelle membranes in eukaryotes. It highlights the fluid nature of the lipid bilayer and the mosaic of proteins embedded within.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the fluid-mosaic model, which component is primarily responsible for restricting the movement of other molecules in the membrane?
Phospholipids
Proteins
Cholesterol
Glycoproteins
Answer explanation
Cholesterol is primarily responsible for restricting the movement of other molecules in the membrane by fitting between phospholipids, thereby stabilizing the membrane structure and reducing fluidity.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is NOT a component of the fluid-mosaic model of membrane structure?
Phospholipids
Proteins
Glycolipids
Nucleic acids
Answer explanation
The fluid-mosaic model includes phospholipids, proteins, and glycolipids as key components of the cell membrane. Nucleic acids, however, are not part of this model, making it the correct answer.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary role of phospholipids in the cell membrane?
Energy storage
Structural framework
Genetic information
Enzymatic activity
Answer explanation
Phospholipids form the structural framework of the cell membrane, creating a bilayer that provides integrity and fluidity, essential for cell function. They do not primarily serve in energy storage, genetic information, or enzymatic activity.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which component of the cell membrane is involved in cell recognition and signalling?
Phospholipids
Proteins
Glycoproteins
Cholesterol
Answer explanation
Glycoproteins are essential for cell recognition and signaling as they have carbohydrate groups attached, allowing cells to communicate and identify each other. This function is crucial for immune response and tissue formation.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What characteristic of the fluid-mosaic model allows for the movement of proteins within the membrane?
Rigid structure
Fluidity
Fixed positions
Solid state
Answer explanation
The fluidity of the fluid-mosaic model allows proteins to move laterally within the membrane, enabling dynamic interactions and functions. This characteristic is essential for cellular processes, unlike rigid or fixed structures.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes the arrangement of phospholipids in the cell membrane?
Randomly scattered
Single layer
Bilayer
Triple layer
Answer explanation
The cell membrane is primarily composed of a phospholipid bilayer, where two layers of phospholipids arrange themselves with hydrophilic heads facing outward and hydrophobic tails inward, providing structure and fluidity.
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does cholesterol affect the fluidity of the cell membrane?
Increases fluidity
Decreases fluidity
Has no effect
Completely solidifies the membrane
Answer explanation
Cholesterol decreases the fluidity of the cell membrane by fitting between phospholipids, making the membrane less permeable and more rigid. This stabilizes the membrane structure, especially at higher temperatures.
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