Membrane Structure and Function
Biological membranes are like water beds because

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

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

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

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