Homework Answers
The answer to your query is as follows:
The lipid that is an important component of most cell membranes is cholesterol.
Cholesterol has a complex ring structure which provides stability to the cell membrane at different temperatures.It tends to immobilise the outer surface of the cell membrane and thus maintains the rigidity of the membrane by reducing the fluidity of it.
When the cell is placed in high temperature conditions, the cholesterol of the membrane interferes with the phospholipid fatty acid chains movement and thus the membrane is permeable only for small molecules.
When the cell is placed in low temperature conditions, cholesterol prevents the cell membrane from freezing by interfering between the fatty acid chains of phospholipid.
Hope it helps.
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