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

An Investigation to determine changes of membrane permeability in beetroot cells.

Extracts from this document...

Introduction

An Investigation to determine changes of membrane permeability in beetroot cells Aim: To witness the changes of the solutions due to the release of coloured enzymes in the beetroot cells, in order to monitor the changes in membrane permeability. This would be done by, using a colorimeter tube to measure the amount of red colour that diffused out of the beetroot. Hypothesis: Several pieces of beetroot of the same length are being tested at different temperatures to see, which beetroot will allow the most enzymes to diffuse out. Referring to the factors that affect the rate of diffusion it can be argued that the piece of beetroot undergoing the test at the highest temperature, which in this case is 80�c would allow the chemicals to diffuse out of the beetroot faster than if they are tested at lower temperatures. ...read more.

Middle

In other words molecules at a higher temperature will diffuse faster than molecules at a lower temperature at a same given time. A Table Of The Amount Of Colour That Diffused Out Of The Beetroot Cell At A Given Temperature Temperature �C Time in water bath (min) Time in deionised water (min) Colour diffused (%) 80 1 30 21 60 1 30 71 40 1 30 92 20 1 30 49 5 1 30 82 Conclusion: The results for the practical does not relate to the data quoted in the hypothesis. In the hypothesis it was stated that the graph would show a gradual depreciation from the left side to the right, but what has actually happened is that the graph has shown no correlation. ...read more.

Conclusion

For example a beetroot left in a water bath at 60�c for over a minute could have had more colour diffused out than a beetroot in a water bath at 80�c for less than a minute. This happened because at times the stopwatch was started at the wrong time, and the beetroot was removed from the water bath late. From looking at the graph it cannot be stated that there are any anomalous results, since there is no correlation on the graph to suggest that one result is anomalous, while the other is not. The conclusion cannot really be reliable since the results are completely unreliable. The conclusion concludes that the hypothesis is correct but since this was not put into good practice there is no data to back it up. Felix Adams ...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

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 Practical Write up

    3 star(s)

    Therefore for the final experiment lengths of 2mm are acceptable. From my preliminary results different lengths do affect the light transmission percentages, but considering that to cut beetroots at specific lengths accurately is time consuming. This might affect the speed at which the experiment is completed at and whether all aspects of safety and accuracy are induced.

  2. Marked by a teacher

    Effect of different temperatures on the permeability of beetroot cell membrane.

    3 star(s)

    specific shape is changed this will cause the cytoplasm and other substances contained within the membrane to leak out.

  1. Marked by a teacher

    effect of temperature on beetroot pigment through membrane

    3 star(s)

    Evaluation I have one anomaly in my results at 40oC with the average transmission percentage of 44.6%. This is an anomaly because it does not fit the smooth negative curve shape, I would have predicted an average value of 66% transmission.

  2. Marked by a teacher

    An investigation to examine the effects of temperature on membrane stability in beetroot, by ...

    3 star(s)

    The double carbon bond causes a 'kink' to occur in the fatty acid, which means that the next phospholipids cannot fit as closely to it as it would have been able to if the fatty acid was saturated. This makes the cell membrane more fluid as there are gaps within the bilayer; this also makes it more permeable.

  1. Marked by a teacher

    Effect Of Detergent Concentration On Membrane Permeability Of Beetroot Cells

    substances contained within the membrane to leak out, so to maintain a good result test should be done in the same places. The same size discs of beetroot must be used throughout, otherwise larger pieces would leak more beta cyanine and make a given detergent concentration have a higher colour intensity, in comparison to the other detergent concentrations.

  2. Permeability of Cell Membrane in Beetroot Cells

    The result for 80?C may be explained by the possible evaporation of water in the test tube due to the high temperature, causing the solution's concentration to increase, decreasing the absorbency. This could be prevented by using a bung in the test tubes.

  1. TEMPERATURE ON BEETROOT PERMEABILITY

    Looking at the graph, the reason why the amount of betalain pigment increases gradually (from 35�C to 67�C) is because most mammalian protein's denature and tertiary structure unravels (the strong covalent bonds between the R groups of amino acids in the polypeptide chains are destroyed)

  2. An experiment to test the effect of different temperatures on the permeability of cell ...

    Each piece of beetroot is cut from the same beetroot. Amount of water added to each test tube. Same colorimeter with the settings unchanged is used. Ranges The input variables would be between 20�C and 80�C, and results would be taken in intervals of 10�C, resulting in input temperatures of 20�C, 30�C, 40�C, 50�C, 60�C, 70�C, and 80�C.

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