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Factors affecting cell membrane permeability.
Member rating: No Rating | Words: | Submitted: Thu Jan 29 2004
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Factors affecting cell membrane permeability Aim: to investigate the factors affecting cell membrane permeability of red cabbage, using absolute alcohol (10 cm3), 1 M hydrochloric acid (10 cm3), 1M sodium hydroxide (10 cm3), and distilled water (10 cm3), and change of temperature (40 oC, 65 oC, 100 oC) Hypotheses: If the leaf discs are not rinsed, the distilled water will change colour, because the pigments can escape from the cell destroyed by cutting the cabbage. If the temperature increases, the solution will become more and more coloured, because the membrane becomes more and more permeable. Independent variables: for tubes 1-2: rinsing or not rinsing the leaf discs, for tube 3-5: the environment, (for tubes 4-5: pH), for tubes 6-8: temperature Dependent variable: for tubes 1-2: change of colour of the solution, for tubes 3-5: change of colour of the solution, for tubes 6-8: intensity of colour of the solution Controlled variables: for all tubes: species, size...
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