This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Major site of protein glycosylation is ? 
Select and explain. 
A. ER and golgi body, B. Ribosome and golgi body, C. ER and ribosome, D. Ribosome and cytoplasm
A: ER and golgi body
Answer: A: ER and golgi body 
Explanation: Ans. is 'a' i.e., ER and golgi body N- Glycosylation occurs in ER and O-glycosylation occurs in golgi apparatus.