Membrane Structure and Function
Bacteriorhodopsin

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

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

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

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