They are used in cleaning our drinking water, treating sewage, processing foods and keeping pharmaceuticals safe—membranes are a crucial part of everyday life.

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(ii) Change the solution and continue soaking for 20 min. 7| Cut a piece of nylon or nitrocellulose membrane and two sheets of thick blotting paper ∼1 mm larger than the gel in each dimension.

Cell structure Description Function Cell type Cell wall Freely permeable layer surrounding cell membrane. The cell wall of plant cells is made from cellulose. This gives them a rigid structure.