Membrane Structure and Function
Exocytosis is the secretion of proteins

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

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

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Membrane Structure and Function
Cholesterol is somewhat amphipathic due to

the five-methyl groups along with the hydrocarbon chain
the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
the long branched hydrocarbon along with the four hydrocarbon rings
the three six-membered rings along with the single five-membered ring

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