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Beetroot Experiment.

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Beetroot Experiment Introduction: The function of a cell membrane is to control the transport of substances moving into and out of a cell. The membrane is partially permeable due to its thin layer. It consists mostly of lipids and proteins. The lipids found in cell membranes are triglycerides; they have one molecule of glycerol chemically linked to three molecules of fatty acids, the majority being phospholipids. Despite their many differences in appearance and function, all cells have a surrounding membrane (called the plasma membrane), which contains the cytoplasm. All cells have a variety of chemical reactions that enable them to grow, produce energy, and remove waste, which is known as metabolism. All cells contain hereditary information, encoded in molecules of (DNA), that directs the cell's activities and enables it to reproduce, passing on its characteristics to its offspring. These and other similarities show that there is a constant link between current cells and the first cells that appeared on earth. ...read more.


Once you have some uniform cylinders collected, they must then be cut into 5 pieces of equal lengths-3mm. Since the beetroot has been cut some of the cell membranes had been broken, which means some anthocyanin will leak out. This must be completely washed off to sustain the reliability of the results, doing so by drying the beetroot with paper towels. The water inside the water beaker is then to be heated to 85 Celsius using the Bunsen burner and tripod. Get another water beaker of a smaller size and place distilled 20cm3 of distilled water into it. Heat it to 20 degrees Celsius, remove the Bunsen burner from underneath the tripod place the 5 pieces of beetroot into the distilled water at the same time start the stopwatch. Keep the beetroot in the distilled water for 5 min. After 5 min, stir the solution 5 times to ix the solution to make the whole solution the same colour. ...read more.


These results are not a good example for my hypothesis, there is no direct correlated pattern and many variables could have affected the results. Evaluation: The first problem encounted was the size of the beetroot pieces. The pieces could be the same in measurement but there mass could have been different and there surface areas differed to one another. This obviously affects the experiment and I should have weighed the beetroot pieces before the experimental stage. The other difficult variable to maintain was the temperature, when the Bunsen burner was removed from underneath the tripod. The recording of the reaction was 5 minutes. The temperature could fall dramatically in 5 minutes, which makes the results unreliable. Using distilled water, which is the clearest possible liquid was good. It meant that even the smallest variation in colour could be detected by the colorimeter. External variables were a problem, an example would be the wind coming through the window, it would blow heat to one direction disadvantaging other areas. If the experiment were to be repeated temperature stability would have to be resolved. A template for the beetroot could also be used. ...read more.

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Marked by teacher Adam Roberts 29/05/2013

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