Membrane Structure and Function
Peptidoglycan is a complex consisting of

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

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

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