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
Molecular size of protein is determined by? 
Select and explain. 
A. Sedimentation, B. SDS-PAGE, C. Salting out, D. Liophilization
B: SDS-PAGE
Answer: B: SDS-PAGE 
Explanation: The molecular size of protein is estimated usually by SDS-PAGE. Other common methods are mass spectroscopy and MALDI.