Final answer:
The glycoproteins produced by infected cells that interfere with viral replication and impede its spread are called interferons.
Step-by-step explanation:
The glycoproteins produced by cells infected with a virus that interfere with viral replication and impede its spread are called interferons. These interferons are a type of protein released by host cells as a response to viral infection. They act by stimulating nearby cells to produce antiviral proteins, preventing the virus from spreading further in the body.