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
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 three six-membered rings along with the single five-membered ring
the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule

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