Membrane Structure and Function
Bacteriorhodopsin

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

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Membrane Structure and Function
Exocytosis is the secretion of proteins

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

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