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

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

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

the five-methyl groups along with the hydrocarbon chain
the long branched hydrocarbon along with the four hydrocarbon rings
the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
the three six-membered rings along with the single five-membered ring

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

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
the products of the reaction move in a specific direction

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