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This cell membrane structure separates the contents of the cell from outside. The membrane has tiny holes in it which allows small molecules to pass through but not larger ones. This is known as semi-permeability. Beetroot contains red pigments called betalains in the cell vacuole and normally do not pass through the membrane. However when cooked, the dye leaks out and so I am investigating the effect of different temperatures on the amount of dye and the extent of damage on the beetroot membrane structure which causes the holes to allow larger molecules through. For molecules to move as a whole, they require a certain amount of energy...
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