Membrane Structure and Function
Bacteriorhodopsin

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

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

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

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