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

Effect of Temperature on Membranes

Extracts from this document...

Introduction

SL Biology: Practical 5: Report Aim: to investigate the Effect of Temperature on Membranes Background: The colour of beetroot is due to the presence of a red pigment, betacyanin in the cell sap. As long as the cells and their membranes are intact, the betacyanine remains inside the vacuoles in the cells. However, if the membranes are stressed of damaged, betacyanin will leak through the membrane and produce a red colour in the water surrounding the beet tissue. Such stress or damage can be caused by heat. The intensity of this red colour will allow for the assessment of the damage produced by experimental treatment. Hypothesis: The higher the temperature, the higher the damage done to the cell membrane, and thus the more betacyanin released into the water surrounding the beet tissue. This will lead to a more intense shade of red. Materials, procedure: [as stated in practical] Variables: Dependent variables: the intensity of the redness in the water Independent variables: the 6 temperatures of water which the samples were submerged in Controlled variables: thickness of the discs (3mm), time span which discs are washed in water (5 min), volume of water in each test ...read more.

Middle

* The standard error is very small across the 2 samples for each temperature. This shows that the data is probably very accurate since it does not vary much. * From the graph, it is seen that there is a steady, consistent and linear increase in the absorbancy with increasing temperature. * This is in line with the background information which states that the higher the temperature, the more damaged the cell membrane gets. More betacyanin is released from the cell vacuoles, leading to a more intense shade of red, therefore resulting in a higher absorbancy. Thus, this supports the hypothesis. Evaluation * The results seem to be generally reliable, since they correspond with the understanding of how cell membranes are damaged by heat. * However, experimental errors could have occurred. For example, due to parallax error, it is difficult to ensure that all the discs are cut to exactly 3mm in diameter. Percentage error can occur in the variations of thickness of discs, leading to inaccurate amounts of betacyanin being released. This would affect the results since we are only looking at temperature as a cause of the higher amount of betacyanin released. ...read more.

Conclusion

The first one to be put in will also be the first one to be taken out. This will ensure that all the samples have the same amount of time for the betacyanin to be released and therefore ensure a more accurate result. * Instead of using a blade to cut the beetroot, a hard boiled egg cutter should be used. This can hold the beet root in place and ensure that each disc is consistent in its width. It is also swift and clean in cutting, ensuring that minimal cells are damaged, and even when there is damage done, it ensures that the extent of damage is same to each disc since many are cut at once. Moreover, being able to cut many at once is more efficient and reduces lag time. * The experiment would be extended to temperatures beyond 80 to find out the temperature at which all the betacyanin has leaked out and the absorbancy no longer increases due to increasing intensity of red. Conclusion * The hypothesis is proven true that as the temperature increases, the cell membranes get increasingly damaged and thus release larger amounts of the red pigment betacyanine, causing an increased intensity in the red of the surrounding water, thereby leading to a higher absorbancy. ...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. What is the effect of different body positions i.e. lying down, sitting and standing ...

    The experiment should have been improved by the various methods stated below in order to reduce errors in the data collected, and make the results more reliable. The results of this experiment may be useful to people wishing to understand the demands of their body and how their body responds to different body positions through a change in blood pressure.

  2. The effect of toliet cleaning products on E-coli ...

    One or both of the processes could have occurred for any of the solutions, and in the end both would end with the same result, the elimination of e coli growth. However it is important in future experiments that the individual process is identified as each has different implications (one is possibly more effective than the other).

  1. The effect on osmosis on the egg shell

    Write down the results in table presented below. BEFORE MEASUREMENT AFTER 30 MINUTES AFTER 1 HOUR ? of measurement set 1 set 2 set 3 set 1 set 2 set 3 set 1 set 2 set 3 1 2 ...

  2. In this extended essay I am looking at the effect of different kind of ...

    It is a lengthy process, though. How music affects plant growth, cannot be observed within days of the plant being exposed to music. It takes few weeks to identify the effects of music on plants. Now talking about Chickpea, it is also known as gram seeds. This is an angiosperm.

  1. Allelopathy. Open Investigation Will increasing the number of allelopathic sunflower plants effect the ...

    Plants are green - Leaves are big - Sunflower plants and bean plants are approximately the same height - Dead leaves are present on most bean plants - Bean plants are green and leaves are medium sized - Two sunflower plants have petals - Bean plants' stems are beginning to bend towards the top (minor)

  2. Biology Extended Essay 2009

    be enhanced to produce high quality juice.16 When juice is transferred to the TASTE machine, evaporation results in a loss of fresh juice flavors, color degradation due to thermal heat. The temperature used in the TASTE machine is much higher than the pasteurized orange juice.

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

    Before starting the experiment, we should just wipe the apparatus to ensure zero error. 7. Do not overtime the experiment. 8. When the beetroot was cut some of the membrane was broken causing the pigment to leak out this must be thoroughly cleaned and washed off to secure the accuracy of results.

  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