Multiple Choice
Which property of the cell membrane allows it to act as a highly selective barrier?
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6. The Membrane
Biological Membranes
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What is the function of the cell membrane's selective permeability?
A
To facilitate the movement of only water molecules across the membrane
B
To allow all substances to freely enter and exit the cell
C
To regulate the movement of substances in and out of the cell
D
To prevent any substances from entering or exiting the cell
Verified step by step guidance1
Understand the concept of selective permeability: Selective permeability refers to the ability of the cell membrane to allow certain substances to pass through while restricting others. This is crucial for maintaining homeostasis within the cell.
Identify the components of the cell membrane: The cell membrane is primarily composed of a phospholipid bilayer with embedded proteins. These proteins play a key role in selective permeability by acting as channels or carriers for specific molecules.
Recognize the role of transport proteins: Transport proteins facilitate the movement of substances across the cell membrane. They can be specific to certain ions or molecules, allowing the cell to control what enters and exits.
Consider the importance of selective permeability: By regulating the movement of substances, the cell membrane ensures that essential nutrients enter the cell, waste products are expelled, and harmful substances are kept out.
Evaluate the options given in the problem: The correct function of selective permeability is to regulate the movement of substances in and out of the cell, ensuring the cell's environment is stable and conducive to its functions.
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