Multiple Choice
Why are lipids and proteins free to move laterally in biological membranes?
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6. The Membrane
Biological Membranes
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple 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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