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Endocytosis
Endocytosis
is a form of
active transport
in which a
cell
transports
molecules
(such as proteins) into the cell ( +
cytosis
) by engulfing them in an
energy
-using process. Endocytosis and its counterpart,
exocytosis
, are used by all cells because most
chemical substances
important to them are large
polar
molecules that cannot pass through the
hydrophobic
plasma or
cell membrane
by
passive
means.
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