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An investigation into the effect of temperature on the permeability of cell membranes
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| Submitted: Thu Jul 11 2002
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An investigation into the effect of temperature on the permeability of cell membranes Introduction All plant cells have a cell membrane, as shown in the simple diagram of a plant cell below: Plasma membranes have an external layer of proteins that hold the lipid molecules in a fairly rigid arrangement. Protein lined pores account for the most part of the cells permeability. This structure of a cell membrane is showed below: The cell (plasma) membrane is very important, it controls what enters and exits the cell. It acts as a selective barrier between the internal and external fluid. This process supplies the cell with raw materials and removes waste products. Normally, this done by diffusion. Diffusion is based on differences in concentration. It spreads the substances from high concentration to low concentration. Various things can diffuse through the membrane for example, oxygen, carbon dioxide, ions and water molecules (through osmosis). The molecules move...
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