Membrane Structure and Function
Bacteriorhodopsin

is an integral membrane protein
absorbs light and pumps protons
All of these
contains primarily alpha-helical residues

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Membrane Structure and Function
The membrane proteins that catalyze active transport reactions differ from soluble enzymes as

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

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