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

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

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Membrane Structure and Function
Exocytosis is the secretion of proteins

is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane
is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane
out of the cell across the plasma membrane into the extracellular space
out of the cell across the plasma membrane into the intracellular space

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

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