Membrane Structure and Function
Peptidoglycan is a complex consisting of

aminoacid and carbohydrate
mono-saccharide and protein
polysaccharide and protein
oligo-saccharide and protein

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Membrane Structure and Function
The membrane proteins that catalyze active transport reactions differ from soluble enzymes as

the substrates of the reaction are all outside the cell
they do not enhance the rates of reaction
they are permanently changed during the reaction
the products of the reaction move in a specific direction

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