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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Membrane Structure and Function
The membrane proteins that catalyze active transport reactions differ from soluble enzymes as

they are permanently changed during the reaction
the substrates of the reaction are all outside the cell
they do not enhance the rates of reaction
the products of the reaction move in a specific direction

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