Membrane Structure and Function
Biological membranes are like water beds because

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

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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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