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

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

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Membrane Structure and Function
The membrane proteins that catalyze active transport reactions differ from soluble enzymes as

the products of the reaction move in a specific direction
they are permanently changed during the reaction
they do not enhance the rates of reaction
the substrates of the reaction are all outside the cell

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