Multiple Choice
The role of the cell membrane is most like the job of which person?
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6. The Membrane
Biological Membranes
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What does it mean for a biological membrane to be selectively permeable?
A
It blocks all substances from passing through.
B
It allows all substances to pass through freely.
C
It allows certain substances to pass while blocking others.
D
It allows only water to pass through.
Verified step by step guidance1
Understand the concept of a biological membrane: Biological membranes are structures that separate the interior of cells from the outside environment. They are primarily composed of a lipid bilayer with embedded proteins.
Define selective permeability: Selective permeability refers to the ability of a membrane to allow certain molecules or ions to pass through it by means of active or passive transport.
Identify the role of the lipid bilayer: The lipid bilayer forms the basic structure of the membrane and is selectively permeable due to its hydrophobic core, which prevents the free passage of polar or charged substances.
Consider the role of membrane proteins: Membrane proteins assist in the selective permeability by acting as channels or carriers that facilitate the transport of specific molecules across the membrane.
Conclude with the correct definition: A selectively permeable membrane allows certain substances to pass through while blocking others, maintaining the necessary balance of ions, nutrients, and waste products inside and outside the cell.
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