Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

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

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

the substrates of the reaction are all outside the cell
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

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