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 do not enhance the rates of reaction
they are permanently changed during the reaction

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Membrane Structure and Function
In Fluid mosaic model, the biological membrane can be viewed as

three dimensional solutions of oriented lipids and globular proteins
three dimensional solutions of oriented lipids and carbohydrate
two dimensional solutions of oriented lipids and carbohydrate
two dimensional solutions of oriented lipids and globular proteins

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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 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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