Membrane Structure and Function
Exocytosis is the secretion of proteins

out of the cell across the plasma membrane into the intracellular space
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

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

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