Membrane Structure and Function
Bacteriorhodopsin

absorbs light and pumps protons
All of these
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 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
the five-methyl groups along with the hydrocarbon chain
the long branched hydrocarbon along with the four hydrocarbon rings

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Membrane Structure and Function
In Fluid mosaic model, the biological membrane can be viewed as

two dimensional solutions of oriented lipids and carbohydrate
three dimensional solutions of oriented lipids and carbohydrate
three dimensional solutions of oriented lipids and globular proteins
two dimensional solutions of oriented lipids and globular proteins

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