Membrane Structure and Function
Cholesterol is essential for normal membrane functions because it

cannot be made by higher organisms
spans the thickness of the bilayer
plugs up the cardiac arteries of older men
keeps membranes fluid.

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Membrane Structure and Function
In Fluid mosaic model, the biological membrane can be viewed as

three dimensional solutions of oriented lipids and carbohydrate
three dimensional solutions of oriented lipids and globular proteins
two dimensional solutions of oriented lipids and carbohydrate
two dimensional solutions of oriented lipids and globular proteins

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