Multiple Choice
In a cell membrane lipid bilayer, the phospholipid heads are primarily _____.
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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 function of cholesterol in the cell membrane?
A
It forms the main aqueous channels that allow ions to cross the membrane by facilitated diffusion.
B
It covalently links phospholipid tails together to create a permanently rigid membrane structure.
C
It serves as the primary energy-storage molecule within the membrane for ATP production.
D
It buffers membrane fluidity by reducing permeability and preventing the membrane from becoming too rigid at low temperatures or too fluid at high temperatures.
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