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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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
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

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