Multiple Choice
Which statement best describes the plasma membrane of a living plant cell?
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6. The Membrane
Biological Membranes
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What does it mean that the cell membrane is selectively permeable?
A
It prevents all substances from entering or leaving the cell.
B
It allows all substances to pass through freely.
C
It allows only water molecules to pass through.
D
It allows only certain molecules to pass through while blocking others.
Verified step by step guidance1
Understand the concept of selective permeability: Selective permeability refers to the ability of the cell membrane to regulate the passage of substances in and out of the cell.
Recognize the structure of the cell membrane: The cell membrane is composed of a phospholipid bilayer with embedded proteins, which play a crucial role in selective permeability.
Identify the role of transport proteins: Transport proteins in the cell membrane facilitate the movement of specific molecules across the membrane, contributing to its selective nature.
Consider the types of molecules that can pass through: Small nonpolar molecules and water can pass through the membrane easily, while larger or charged molecules require specific transport mechanisms.
Reflect on the biological significance: Selective permeability is essential for maintaining homeostasis within the cell, allowing it to control its internal environment by regulating the substances that enter and exit.
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