Membrane Structure and Function
Cholesterol is essential for normal membrane functions because it

spans the thickness of the bilayer
keeps membranes fluid.
plugs up the cardiac arteries of older men
cannot be made by higher organisms

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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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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

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

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

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