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

The aim of the investigation is to find out how an increase in surrounding temperature affects the activity of the plasma cell membrane of beetroot cells.

Extracts from this document...

Introduction

The effect of Temperature on Beetroot Membranes Introduction: All multi cellular cells are made up of a number of organelles. To function properly, a cell needs to be able to control the transport of substances, and this is done through a selectively permeable membrane (8-10 micrometers thick.) Beetroot contains red pigments that are found within the cell vacuole. Generally, the red pigment cannot pass through the cell membrane unless the cell is damaged, and in this case, the cell bleeds from the cell. The amount the beetroot 'bleeds' from a sample is an indication of the degree of damage. The following experiment can establish what effect an increase in temperature has on the plasma membrane. Aim: The aim of the investigation is to find out how an increase in surrounding temperature affects the activity of the plasma cell membrane of beetroot cells. Hypothesis: I predict that the beetroot will 'bleed' more dye as the surrounding temperature increases. This is because I expect that higher temperatures will distort and denature the 'active site' and therefore will effect the shape of the fluid mosaic model membrane. The increase of kinetic energy, (through an increased temperature) will speed up the diffusion rate of the red pigment (betalains) and then due to the damage of the membrane and the denatured carrier proteins, this will increase the amount of dye that is 'bled' out of the cells resulting in a higher absorbance rate. ...read more.

Middle

The graph clearly shows how an increase in temperature can affect the membrane activity (which is shown through the absorbance percentage using a colorimeter.) The steep incline shown on my graph (between 60-80 degrees) represents the point in which the protein in the membrane cells are becoming denatured (due to the increased temp) and allowing more of the red pigment to leave the cell. The cell membrane has a phospholipid layer, which is made up of fatty acids and when it is placed in a high temperature, the layer becomes more fluid and therefore becomes more delicate. When the carrier proteins in the cell membrane become denatured (the optimum temperature for enzymes is between 10-35 degrees approx.) they form holes and destroy the delicate layer in the membrane. This results in the beetroot pigment 'bleeding' through and any pigment in the membrane will now exit the cell. This is represented between 40 degrees and 80 degrees in relation to the absorbance level increasing. With reference to my hypothesis, the increase in temperature will increase in the amount of kinetic energy as the water will be hotter and expand resulting in more vibrations will pass through the water (kinetic energy), which will result in an increase in the diffusion rate of the pigment. Once the temperature reaches above approx. 40 degrees, the cell membrane plasma will denature due to the surrounding temperature being too high and consequently the beetroot pigment in the cell membrane will eventually leak out. ...read more.

Conclusion

The fact that the class put all the data together meant that there was room for variety in the results as different people using different equipment each did their own experiment. This is a clear indication that the results were not as accurate as they could have been. The smaller the percentage means that there is less variety within the data. Due to the standard deviation and error bars results it shows that the experiment may have encountered a few problems. To decrease the % of error bars or standard deviation, I could do more repeats of the experiment. However, by taking an average, which I did with each sample I think that this can show a level of accuracy with my results as because I had 5 samples, I was able to add all the results together to find a mean of the data and then plot this on a graph. In addition to this, by using a control sample of water to test the colorimeter, it meant that I could prove my colorimeter was working properly as when tested, it gave the correct absorbance percentage. Other procedures I used to ensure that variation and errors were kept to a minimum were all the beetroot cylinders were cut with the cork borer and I used a stopwatch to ensure that all test tubes were kept in for the same amount of time. If I had to do the experiment again, another variable I could measure, instead of temperature is how the PH affected the cell membrane activity. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Biology 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 International Baccalaureate Biology essays

  1. Marked by a teacher

    Neurology and Behaviour. Focus question: Is there an increase in the perception and ...

    5 star(s)

    Quantitative Data: Table 3: Raw Data for the Female Participants Disgust Responses Participant Number Image No. 1 2 3 4 5 6 7 8 9 10 1 1 1 1 1 4 1 1 3 1 2 2 1 3 1 1 1 1 2 4 3 4 3 1

  2. Investigating the effect of pH of Hydrogen Peroxide upon the activity of Catalase

    at this pH, and this prediction was backed up with the preliminary work I did prior to the experiments. With the results obtained from my experiment, I can further conclude that my experiment got the results that I had predicted.

  1. Modelling Surface Area to Volume Ratio in Cells with Agar Cubes

    of the object can also have an effect on the penetration percentage of diffusion. It is important that cells have a large surface area to volume ratio that they can get enough nutrients into the cell. They can increase their surface area by flattening and becoming longer or by having a rough surface with lots of folds of cell membrane.

  2. Biodiversity Investigation The aim of this investigation is to determine plant biodiversity of both ...

    Region B (Quadrats 10 feet away) Rye Grass 2 18 Dandelions 2 8 Legumes 13 2 Rumex Chinese Fire Weed Mint 16 Clovers Bermuda Grass Figure 1.9 - Raw Data obtained from counting plant species and quantity in Location 9 Location 9 Region A (Quadrats next to the pond)

  1. Ecology Open Investigation Does the geographic location affect the biotic and abiotic ...

    The units of measurements is also included on the graph. Note: See Appendix for history data values Graph 2.2 - This graph compares the average sensitivty score of Brown Lake and 18 Mile Swamp in year 2004, 2005 and 2009.

  2. Osmosis Experiment. This experiment is to consider how salinity influences osmosis in potato cells.

    If it was too less, the whole potato may not be fully covered by the salt water and if the volume of water is too large, when the potato cube is put into the test tube, it may cause the water to spill.

  1. Effect of Detergent on Membrane Permeability

    solutions with concentration of 8% and higher float, presumably by the increase in density that the detergent causes After 10 minutes, we removed the pieces of beet from the microwell. We noticed that the wells with 4% detergent solution had the clearest, yet darkest purple color, whereas other wells are more translucent with lighter color.

  2. Beet Lab. Aim: To determine the effects of temperature on the permeability of ...

    {3} With increasing temperature, the structural integrity of the cellular membrane is compromised because the proteins that make up the plasma membrane are denatured and lose their shape. Secondly, the effects of temperature extremes like extreme cold and heat were tested on the permeability of the beet root membrane.

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