This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
Endoplasmic reticulum do not paicipate in 
Select and explain. 
A. Protein synthesis, B. Muscle contraction, C. Protein soing, D. Glycoproteins
B: Muscle contraction
Answer: B: Muscle contraction 
Explanation: Rough Endoplasmic Reticulum is involved in protein synthesis. EPR also involved in glycosylation of N linked glycoproteins. Exocytic pathway of protein soing is done by both RER & GA (Golgi apparatus) Reference: Harper; 30th edition