Membrane Structure and Function
Bacteriorhodopsin

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

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

the five-methyl groups along with the hydrocarbon chain
the long branched hydrocarbon along with the four hydrocarbon rings
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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