Biochemistry General a6b483a7 Major site of protein glycosylation is ? A ER and golgi body B Ribosome and golgi body C ER and ribosome D Ribosome and cytoplasm High-Yield Explanation Ans. is 'a' i.e., ER and golgi body N- Glycosylation occurs in ER and O-glycosylation occurs in golgi apparatus.