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Why does the colour leak out of cooked beetroot? Aim: To investigate what effect temperature has on membrane structure. Background Knowledge: Despite their many differences in appearance and function, all cells have a surrounding membrane (called the plasma membrane). The cell membrane of plant cells is an important part of the cell because it controls the transport of substances needed by the cell, such as water and molecules dissolved in the water (salts and glucose), both into and out of the cell. The actual membrane is a very thin layer of about 8 to 10 manometers wide, and is partially permeable. It is composed largely of lipids and proteins. Most of the lipids on the cell membranes are triglycerides (they have one molecule of glycerol chemically linked to three molecules of fatty acids) and the skin of the membrane is made of phospholipids. These phospholipids are arranged into two layers of...

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