Cholesterol: embeds itself in the membrane, maintaining membrane fluidity
At ↓ temperature: prevents close packing of phospholipids = ↑ membrane fluidity
At ↑ temperature: constrains motion of phospholipids = ↓ membrane fluidity
A primary function of cholesterol in the plasma membranes of some animals is to
A) facilitate the removal of hydrogen atoms from saturated phospholipids.
B) enable the membrane to stay fluid more easily when the temperature drops.
C) make the membrane more rigid, allowing it to resist pressure from outside the cell.
D) facilitate cell-cell interactions by binding to receptors on neighboring cells.
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