<prompt> Major site of protein glycosylation isER and golgi bodyRibosome and golgi bodyER and ribosomeRibosome and cytoplasm  <response>: Because many glycosylation reactions occur within the lumen of the Golgi apparatus, carrier systems permeases and transpoers are required to transpo nucleotide sugars across the Golgi membrane.Ref: Harpers Illustrated Biochemistry, 30th edition, page no: 572 