Membrane Structure and Function
Biological membranes are like water beds because

All of these
they are always moving
they (normally) do not leak their contents
the membrane is thin compared to the enclosed volume

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

the long branched hydrocarbon along with the four hydrocarbon rings
the five-methyl groups along with the hydrocarbon chain
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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