• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Beetroot Experiment.

Extracts from this document...

Introduction

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.

Middle

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.

Conclusion

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Molecules & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay

3 star(s)

***
A lack of detail and insufficient use correct A level terminology limits the star rating of this account.

Marked by teacher Adam Roberts 29/05/2013

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Molecules & Cells essays

  1. Marked by a teacher

    Beetroot contains red pigments called betalains, located within the cell vacuole. Normally the pigments ...

    4 star(s)

    This backs up my hypothesis in my plan. This is because as temperature rises the movement of the phospholipids increase allowing more pigment to move across the membrane. As temperature rises to a point which the proteins in the membrane get de natured.

  2. Marked by a teacher

    The Effect of Ethanol Concentration on the Permeability of Beetroot Cell Membranes to Betalain

    3 star(s)

    Prediction 'Electron microscopic examinations of cell membranes have led to the development of the lipid bilayer model (also referred to as the fluid-mosaic model). The most common molecule in the model is the phospholipid, which has a polar (hydrophilic) head and two non-polar (hydrophobic)

  1. Investigation of the effect of adding different concentrations of NaCl to an enzyme-substrate (amylase-starch) ...

    Amount of NaCl in solution (cm�) Number of iodine drops added at 10 second intervals Time taken for solution to change colour from orange to blue/black (seconds) 0.0 48 480.5 1.0 8 80.0 0.8 9 89.5 0.6 10 99.5 0.4 11 110.0 0.2 20 120.5 Second Run Table to show

  2. To find out how different concentrations of sucrose solution affect the incipient plasmolysis of ...

    1.19 Mean 1.26 1.29 1.23 1.24 1.24 1.23 1.24 1.14 1.27 1.22 Difference (g) 0.03 0.01 -0.01 -0.1 -0.05 Percentage Change (%) 2.33 0.81 -0.81 -8.06 -3.94 Solution (Molar) 0.3 0.4 0.5 0.6 0.7 Before After Before After Before After Before After Before After Run 1 30 32 30 31

  1. Type - 1 Hypersensitivity Reaction

    of histamine was added. When the 1ml of egg albumin was added the first time a contractile response was noted. However when the second dose was added a contractile response was not noticed When 0.2 ml of 10-4 mepyramine and 0.4 ml of 10-4 histamine was added 30 seconds later

  2. Permeability of Cell Membrane in Beetroot Cells

    Transport all the cuvettes in the order they were collected in a stable carrier to the colorimeter for testing. 12. Pour distilled water into a cuvette as a reference and place into colorimeter and press the reference key, this allows the colorimeter to have something to compare the absorption of the sample to.

  1. The effect of different temperatures on the movement of maggots.

    enzymes they start to denature reducing the rate of respiration and therefore the amount of energy produced. The maggots would become 'sluggish' and gradually, as the temperature increases and all of the maggot's enzymes denature, they will die. Hypothesis: -The maggots movement across a 15cm distance will be fastest at

  2. The Effect Of Copper Sulphate On Pepsin Activity.

    * I have also decided to change the time of my reading from every 30 seconds to every 60 second as I did not get enough time to make accurate reading every 30 seconds New Method With Modifications I first prepared the following concentrations of copper sulphate solution by mixing

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work