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To investigate one of the factors that affects the permeability of cell membranes.
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| Submitted: Sun Dec 15 2002
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Permeability of Cell Membranes Practical Aim: To investigate one of the factors that affects the permeability of cell membranes. Prediction: There are many factors which can affect the permeability of a cell membrane. These factors include temperature, alcohol, detergents, salt (sodium chloride), chloroform, pH levels and paraffin oil. Cell membranes are important for allowing nutritive, respiratory and excretory processes in plants, animals and single-celled organisms. To allow this to happen correctly the membranes are semi permeable, so that they allow small molecules such as sugars and salts to pass through, but not large molecules like proteins. Beetroot cells contain a red pigment called anthocyanin, a substance which cannot pass through the membrane when it is intact. The concentration of the pigment in different parts of the plant is quite homogenous. This means that beetroot is good to use to measure the permeability of cell membranes because there is a brightly coloured pigment that is easy...
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