Membrane Structure and Function
Bacteriorhodopsin

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

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

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
the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule

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

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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 do not enhance the rates of reaction
the substrates of the reaction are all outside the cell
they are permanently changed during the reaction

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