Membrane Structure and Function
Biological membranes are like water beds because

All of these
the membrane is thin compared to the enclosed volume
they are always moving
they (normally) do not leak their contents

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Membrane Structure and Function
Exocytosis is the secretion of proteins

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

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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 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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