This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Microbiology Pa 1 (History, Microscopy, Stains and Structure and Physiology of Bacteria), Subject name: Microbiology
Cell wall can be demonstrated by : 
Select and explain. 
A. Microdissection, B. Electron microscopy, C. Differential staining, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: The cell walls can be demonstrated by: (1) Differential staining procedure (2) Electron microscopy (3) Plasmolysis (4) Microdissection (5) Mechanical rupture of the cell (6) Serological test by exposure to specific antibodies.