Multiple Choice
In the context of the lipid bilayer, the primary structural components of the cell (plasma) membrane are:
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8. Membrane Structure
The Lipid Bilayer
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In the context of the lipid bilayer, what is the primary role of cholesterol in the cell membrane?
A
It forms aqueous channels that allow ions and polar molecules to diffuse freely across the membrane.
B
It buffers membrane fluidity by restricting phospholipid movement at high temperatures and preventing tight packing at low temperatures, helping stabilize the bilayer.
C
It covalently cross-links phospholipids to make the membrane permanently rigid and impermeable.
D
It serves as the main energy-storage molecule in the membrane by forming triacylglycerols within the bilayer.
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The Lipid Bilayer practice set
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