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Why can glycoproteins act as both receptors and receptor sites? How does a glycoprotein act as an antigen? please explain or provide websites, thank you 1. Receptors: They can have many unique structures. (They're just proteins with carbohydrate side-chains) Receptor Sites: They can embed themselves into phospholipid bilayers (membranes).

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Why can a glycoprotein act as a receptor? Glycoproteins don’t just bind other glycoproteins; they also bind other types of molecules. For example, viruses use glycoproteins to bind to a target host cell. Once bound to the glycoprotein receptor, the receptor triggers a signal that causes the cell to engulf the virus.