Membrane Structure and Function
Bacteriorhodopsin

contains primarily alpha-helical residues
absorbs light and pumps protons
All of these
is an integral membrane protein

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Membrane Structure and Function
Exocytosis is the secretion of proteins

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

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