Prosthetic group of a glycoprotein consists of 

Prosthetic group of a glycoprotein consists of carbohydrate.

Glycoproteins belong to the category of conjugated proteins. These are composed of a protein molecule joined to a non-protein group called the prosthetic group. The prosthetic group in a glycoprotein is carbohydrate. The glycoproteins make up components of blood. Other type of conjugated proteins are lipoproteins (present in cell membrane), nucleoproteins (present in nuclear materials), etc.