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
they are permanently changed during the reaction
they do not enhance the rates of reaction
the products of the reaction move in a specific direction

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Membrane Structure and Function
Exocytosis is the secretion of proteins

out of the cell across the plasma membrane into the extracellular space
is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane
is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane
out of the cell across the plasma membrane into the intracellular space

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

the three six-membered rings along with the single five-membered ring
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 five-methyl groups along with the hydrocarbon chain

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