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


Extracts from this document...


THE EFFECT OF TEMPERATURE ON THE MOVEMENT OF PIGMENT THROUGH THE CELL MEMBRANES ________________ Table showing the effect of different temperature levels in degrees Celsius on the movement of the red anthocyanin pigment from the beetroot cell to distilled water after 30 minutes, using a colorimeter to measure solute concentration as determined by % transmission Temperature in degrees Celsius. ±1°c % transmission of light through solution in the cuvette. ±1% Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 % transmission mean (1 decimal place )±1% Standard deviation(%) (1 decimal place) 85 56 48 52 62 54 54.4 5.2 80 69 58 54 64 73 63.6 7.8 75 78 66 56 67 78 69.0 9.3 70 85 71 68 72 83 75.8 7.7 65 88 80 82 82 93 85.0 5.4 63 92 88 90 84 98 90.4 5.2 60 94 92 90 96 98 94.0 3.2 55 96 94 92 98 99 95.8 2.9 50 96 98 98 99 99 98.0 1.2 45 98 99 100 100 100 99.4 0.9 ________________ Trial 1 was conducted by me. ...read more.


It also consists of integral proteins which could act as enzymes,as the temperature rises to 85°c,they were denatured thus creating holes for the anthocyanin to diffuse easily. Therefore, to a certain extent, temperature has an effect on the movement of pigment through the cell membranes. The higher the temperature,the more integral proteins are denatured,as a result more holes are created thus speeding up diffusion. EVALUATION WEAKNESSES SOLUTION 1.the beetroot roots were not precisely of the same size. This could have affected the rate of diffusion and the amount of anthocyanin released in the distilled water. If one of the roots were larger, there would be a higher area for diffusion,thus speeding it up and more pigment would be released as it would have more cells and vacuoles containing the pigment. This would defy the rule of keeping all but one variable constant and the experiment wouldn’t be fair. 1. this problem could be solved by using special sharp cutting tools like scalpels for cutting the beetroot roots and using a microgauge to accurately measure the sizes of the beetroot samples. ...read more.


almost equal to that of the test tube,so the discs would get stuck inside whilst trying to retrieve them with a mounted needle.this added to the time the disc should have stayed in the test tube, thus giving wrong results as the variable was not constant 5. discs with a smaller equal circumference could be used so that the disc is easily retrieved on time. 6. there was no control experiment against which i could compare my results to establish that temperature increase was responsible for increased diffusion of anthocyanin out of the cells. 6.a control could be provided. A beetroot disc in the distilled water without heating it for 30 minutes could be used as control. 7. Pooling the data caused high standard deviations as each student might have carried out the experiment in a slightly different way,thus making the mean unreliable 7.this could be solved if each student conducted a particular number of trials themselves so that the data obtained can be consistent thus giving a more reliable mean with low standard deviation. . ...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. The effect of toliet cleaning products on E-coli ...

    After the 24 hour period zones of inhibition were examined, the diameters of inhibition where indentified as sections of clear agar in contrast to darker surrounding agar.

  2. Biology - HIV Prevention and Transmission

    This cycle repeats all over again and again. HIV usually attacks the CD4 T cells, which is the cells that actually protects us from viruses, but the HIV destroys them and makes the person vulnerable to small diseases. We cannot heal the person after it is infected with AIDS (which is the result of HIV that destroyed many T cells)

  1. Biology- Extended essay. For this research, I investigated the effects of DDT and ...

    The operculum is composed of four fused bones; the opercle, preopercle, interopercle, and subopercle. The posterior rim on the operculum is a flexible, ribbed structure which acts as a seal in order to stop reverse water flow during respiration. For most fish, the operculum is critical in obtaining oxygen.

  2. The aim of the investigation is to find out how an increase in surrounding ...

    cylinders the same as surface area is also a factor that effects the diffusion rate. * It is important to keep the control variable the same as it makes the experiment as fair as possible, in addition to this, you won't be able to know if the changes to the independent variable are causing the changes to the dependent variable.

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

    spectrophotometer, which will measure the % light transmission through the different temperatures. Controlled 1.Time 2. Wavelength maximum 3. Size, colour and type of beetroot 4. Mass of beetroot 5.Temperature 1. Specific timings should for all trials. Trials should be simultaneously stopped by taking out beetroot pieces at the same time.

  2. Testing the effect of substrate concentration on enzymes

    Note all the results in a table such as the one below. 4. After the experiments with the 6%, 4%, 2%, 1% and 0% concentrations of hydrogen peroxide, take out the enzymes and drop it into another 4cm3 of 4% hydrogen peroxide solution.

  1. How will changing the percentage of glucose concentration affect the light transmission percentage from ...

    A stopwatch will be used to measure the time. Size and type of beetroot The same beetroot will be used during the entire experiment. The beetroot pieces are cut using a core borer to ensure the diameter of each piece is constant.

  2. The Effect of Alcohol on Biological Membranes

    Stir the beet in the alcohol solution once every minute with a toothpick. Be careful not to puncture or damage the beet. While one team member is performing this step, another team member should proceed to Step 10. 10. Connect the Colorimeter to the computer interface and prepare the computer

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