Salma Ahmed
English Lit. GCSE Student
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Investigating the effect of temperature on permeability of membranes
- Words:
- 1427
- Submitted:
- Wed Aug 27 2003
Have a little read: ... Investigating the effect of temperature on permeability of membranes The investigation will look into the effect of temperature on membrane permeability using beetroot tissue. Background Cells of the beetroot contain a red dye called anthocyanin. Under normal conditions the dye is held within the cell by the cell membrane. However in an experiment to show the effect of various reagents (such as alcohol and detergent) on membrane permeability, the structure of the membrane is altered and the red dye leaks out of the cells. The reagents alter the phospholipid component of the membrane. Prior knowledge:- Plant cell walls contain cellulose. Cellulose is a polymer of beta glucose. Cellulose fibres have a high tensile strength; this helps the cell to withstand large pressures that develop within it as a result of osmosis. Without this the wall would burst when in a dilute solution. Cellulose fibres are freely permeable allowing water and solutes to reach the
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