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

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

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
the five-methyl groups along with the hydrocarbon chain
the three six-membered rings along with the single five-membered ring
the long branched hydrocarbon along with the four hydrocarbon rings

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