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

Membrane permeability in beetroot cells.

Extracts from this document...


Membrane Permeability in Beetroot cells Beet root cells contains a red pigment, which is found in the cell vacuole. The vacuole has a membrane in which its function is mainly to prevent the betacyanins from leaving the cell. Leakage of these betacyanins into the external solution can be used as an indication of membrance pereambility changes. As part of my experiment, my aim is to see if temperature affects the membrane by witnessing the amount of betacynanins that leaks from the beetroot cells. The cell membrane covers the outside of a cell and consists of a double layered sheet of lipid molecules interspered with proteins. It seperates the cell from the external environment, gives phyisical protection and allows the import and export of selected chemicals. Aim: I will commence the experiment by placing beetroots in a test tube of deionised water, I will use a range of temperatures in which I will place the beetroot cell to see the damage later on. After placing them in series of test tubes of deionised water for 30 minutes. ...read more.


* Measuring cylinder: The amount of deionised water in each test tube has be exactly the same. Otherwise this will create an error in my experiment. Therefore using a measuring cylinder enable my experiment to be fair and accurate. Apparatus: * Goggles, � Ruler * Lab coat �Colorimeter * Beetroot � Petri dish * Cork borer �Tile * Marker � Spatula * Test tubes * Labels * Test tube holder * Deionised water * Thermometer * Measuring cylinder * Cuvette Fair Testing: In this experiment, a fair testing is crucial, as it will indicate whether my results were accurate or inaccurate. I must also ensure all factors are kept the same throughout my practical. Results: Membrane Permeability Table Beet root number Temperature (degrees Celsius) Colorimeter (% Transmission) 1/ % transmission 1 80 64 0.015 2 61 75 0.013 3 42 87 0.011 4 23 96 0.010 5 10 100 0.01 Conclusion, improvements and Evaluation: My experiment is now complete, and I have witnessed a pattern in my observations. ...read more.


The beetroot cells did not stay in the test tubes for 30 minutes approxiamately. This could mean the colour may not have had enough time to diffuse out of the beetroot cells. Hence creating an error in my observations. An error could have also risen from the fact that the beetroots not washed properly . It was also important to have washed out the pigment from the cells that were damaged when using the cork borer. The anomaly I would say was the sample that was placed in a 5�c bath. Which gave me a relatively large percentage of beetroot pigment concentration, due to the fact that the cell membrane could not work at such a cold tempertaure, hence therefore the pigment (betacyanin) was easily diffused. On the other hand despite the fact I made a number of errors during the practical and the fact that I did the experiment alone and was under pressure to complete the practical on time. I can truthfully say I did this practical to the best of my ability. I believe with more practise, I will get the hang of it and next time I would be able to produce a better results. Donald Blankson Hemans - 1 - ...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

A weak experimental report that lacks the depth required to gain good marks in an A level course. Although some results were obtained the key sections were either missing or lacking in key details.
To improve:
Research and Rationale
There needs to be background research carried out and discussed with respect to the likely effect of temperature on the components of a plasma membrane. The references used to inform the plan should be cited.
Although a list of apparatus was present there was no written method and no risk assessment. The key variables need to be listed and the way they will be controlled explained. There was no pilot experiment carried out.
There were some results recorded but no replicates were carried out. The table headings were unclear in some cases.
Interpreting and Evaluating
The interpretation of the results was not linked to biological knowledge and the limitations of the results were not fully discussed. The evaluation was mainly a list of personal failings with regard to measuring and lack of time which would fail to gain credit. The student would need to look more critically at the method ( unfortunately not in the report) and discuss ways that reliability could be improved or the investigation extended.

Marked by teacher Stevie Fleming 01/01/1970

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

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

    3 star(s)

    Variable Temperature. Reason why it must be kept constant in the context of this experiment From knowledge detained from a previous experiment, as well as ethanol having an effect on the permeability of a cell membrane, I know that temperature also has an effect.

  2. An experiment to find of the isotonic point of root vegetables cells in contents ...

    chance of errors and increase the reliability and precision of my results. More accurate than using a knife as it cuts the end edges of the root vegetable to equal lengths. This will enable me to obtain more reliable value for the length.

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

    Also they may have genetic differences because they are from different batches so some may have higher water potentials and others lower water potentials therefore the results obtained will not be precise or accurate because they will have different isotonic points.

  2. Does ethanol causes greater inhibition of pig liver catalase than of yeast catalase

    denatured very effectively as there is a steep rise in the time taken for both catalases up to there. By 0.6mol.dm-3 I think the ethanol has denatured nearly all of the catalase. The two catalases get quite close together I think there is not much more the ethanol can inhibit

  1. Cost effectiveness of mainstream bench cleaners against generic supermarket cleaners on the number of ...

    In a study of a supermarket, it was found that on average the big brand cleaners cost 74p more than the supermarket brand. It was also found that 3 out 5 cleaning products studied across the range, both supermarket own and main brands, contained Benzalkonium Chloride, Tetrasodium EDTA, Sodium Hydroxide and various forms of alcohol.

  2. The Plasma Membrane

    The plasma membrane contains a fair amount of cholesterol whereas the intracellular membranes contain very little cholesterol. These are only slightly soluble in water in pure form, but when complexed with protein molecules, their solubility increases. They also associate tightly with the lipid arms of the phospholipids, this association increases the viscosity and the strength of the membrane.

  1. A Level Biology revision notes

    o Replace saturated with polyunsaturated fats * Omega 3 fatty acids (oily fish) protect from heart disease * Alcohol is not a risk factor for coronary heart disease (CHD)! o In fact, one glass wine per day reduces the risk of CHD Gut Bacteria (Intestinal Flora)

  2. Molecules and cells - Edexcel GCE Biology Revision Notes

    fibres forms * The nuclear envelop breaks down and chromosome lies free in the cytoplasm. METAPHASE * The chromosome line up along the equator of the cell. The chromosome consists of 2 sister chromatids attached by the centromere. * The spindle fibres become attached to the centromere.

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