Membrane Structure and Function
Peptidoglycan is a complex consisting of

oligo-saccharide and protein
aminoacid and carbohydrate
mono-saccharide and protein
polysaccharide and 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 intracellular space
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 extracellular space
is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane

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