Multiple Choice
In animal cells, which molecule is primarily responsible for strengthening the plasma membrane by modulating its fluidity and stability?
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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 plasma membrane?
A
It forms aqueous pores that allow ions to diffuse freely across the membrane without transport proteins.
B
It covalently cross-links phospholipid tails to permanently rigidify the membrane.
C
It acts as the main energy source for membrane-associated enzymes by being rapidly oxidized in the bilayer.
D
It buffers membrane fluidity by reducing permeability and preventing extreme changes in fluidity across temperatures.
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