Multiple Choice
In the context of the lipid bilayer, what is the primary role of cholesterol in the cell membrane?
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8. Membrane Structure
The Lipid Bilayer
Multiple Choice
In the context of the lipid bilayer, what is the primary role of cholesterol in animal cell membranes?
A
It buffers membrane fluidity by reducing permeability and preventing the membrane from becoming too fluid at high temperatures or too rigid at low temperatures.
B
It functions as an integral channel protein that selectively transports ions across the membrane.
C
It forms covalent cross-links between phospholipid tails to permanently stabilize the bilayer.
D
It serves as the main energy-storage lipid within the membrane by being polymerized into glycogen-like chains.
Verified step by step guidance1
Understand the structure of the lipid bilayer in animal cell membranes, which primarily consists of phospholipids arranged in a double layer with hydrophobic tails facing inward and hydrophilic heads facing outward.
Recognize that membrane fluidity is crucial for proper membrane function, affecting permeability, protein mobility, and cell signaling.
Identify cholesterol as a lipid molecule interspersed within the phospholipid bilayer, influencing membrane properties.
Recall that cholesterol's role is to modulate membrane fluidity by inserting itself between phospholipid molecules, which helps prevent the membrane from becoming too fluid at high temperatures and too rigid at low temperatures.
Conclude that cholesterol acts as a fluidity buffer, reducing membrane permeability and maintaining membrane stability, rather than functioning as a channel protein, forming covalent cross-links, or serving as an energy storage molecule.
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