Multiple Choice
Why are lipids and proteins free to move laterally in biological membranes?
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6. The Membrane
Biological Membranes
Multiple Choice
Which statement best describes the role of the cell membrane in the fluid mosaic model?
A
It functions as a static structure that provides mechanical support to the cell.
B
It acts as a rigid barrier that prevents all substances from entering or leaving the cell.
C
It is primarily responsible for the production of energy within the cell.
D
It serves as a selectively permeable barrier that regulates the movement of substances in and out of the cell.
Verified step by step guidance1
Understand the fluid mosaic model: The fluid mosaic model describes the cell membrane as a dynamic and flexible structure composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates.
Identify the key function of the cell membrane: The cell membrane's primary role is to regulate the movement of substances in and out of the cell, maintaining homeostasis.
Recognize the concept of selective permeability: Selective permeability means the cell membrane allows certain molecules to pass through while blocking others, based on size, charge, and solubility.
Distinguish between static and dynamic structures: Unlike a static structure, the cell membrane is fluid and adaptable, allowing for the movement and interaction of its components.
Clarify misconceptions: The cell membrane is not responsible for energy production, nor is it a rigid barrier; it is a selectively permeable barrier essential for cellular function.
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