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The Effect Of Temperature On The Permeability Of The Cell Membrane

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  • Essay length: 5375 words
  • Submitted: 02/10/2008
  • Marked by teacher: (?) Ross Robertson
  • Reviewed by: (?) Arcturus 21/03/2012
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Teacher essay summary

3 star(s)

Overall, a very substantial effort with evidence that the writer has grasped much of the detailed biochemistry relating to thermal instability of membranes.
There is, however, considerable repetition. The writer needs to adopt a much more concise approach to each section, making it very clear what each sets out to achieve.
There is some confusion over the precise details of denaturation and the properties ascribed to lipids and proteins. Furthermore, a much more disciplined use of the terms reliable, accurate and valid is required at this level.
Overall, however, a very considerable effort (5000 words!) at a notoriously difficult topic.

Marked by teacher Ross Robertson 01/03/2013

The first 200 words of this essay...

"The Effect Of Temperature On The Permeability Of The Cell Membrane"

Aim: My aim of this experiment is to investigate whether changing the temperature (independent variable) of the water around a disk of a beetroot will affect the permeability of a beetroot, by measuring the release of pigment (dependant variable) into water using a digital colorimeter. The colorimeter will be used to measure the light absorbency of anthocyanin (the pigment found in the cell membrane of the beetroot) this can help us work out how much diffusion takes place at different temperatures such as 0,20,40, 60 and 80 degrees Celsius.

Introduction

I will be conducting an experiment to find out what effect different temperatures has on the permeability of the Beetroot's cell membrane; the temperatures that I will be testing on the beetroot is 0, 20, 40 and 60 degrees Celsius.

Background Knowledge

Most people think that Beetroot cells are colored red because they contain a red dye called anthocyanin, But in fact they are colored red caused by two distinct pigments, there is a yellow one known as a betaxanthin and a purple pigment known as betacyanin and are together

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Review of essay

Reviewed by: Arcturus

Rating: 3 star(s)

Response to the question

This essay that centers around the investigation on the effect of temperature on the permeability of the cell membrane is very well-written, very detailed on the procedures used, very meticulous on interpreting the results collected to draw concrete conclusions. The report has all the required sections of an investigation and is very detailed. Beginning with the introduction, the writer includes intricate details on not only beetroots but also the dynamic structure of the cell membrane using the fluid mosaic model. The aim itself is very clear in stating the focus of the experiment, the independent and dependent variables, which is commendable for the clarity and focus. The writer also describes a preliminary experiment that was used to plan and perhaps improve on the current style of the investigation, which reflects the earnest efforts of the writer. The details on the materials and methods was amazingly excellent in that not only is the material stated, the writer also includes relevant details regarding these equipment. The procedures described are equally detailed, making constant references to other sections on precautionary methods as well. However, the steps could have been listed instead of a prosaic style for easier understanding. Similarly, the writer could have simplified the presentation style by segmenting the different procedures into various sections. While the methods used are common in any such experiment, the writer’s explanation of these steps is definitely something different. The presentation of a control experiment, detailed explanation on the variables, providing a justified hypothesis is very neatly and appropriately done. The writer’s interpretation of results is also well-written in that all trends observed, the notable aspects f the data such as maxima/minima are indicated clearly. These observations are carefully considered using relevant biological theory and well-justified to form concrete conclusions as well. As a general ending, the writer provides a list of well-explained, realistic improvements to the experimental procedure.

Level of analysis

The depth of the essay is reflected well by the investigation itself. All the sections of the report are very detailed. The use of multiple levels of experiments in the form of preliminary, control and actual experiment is commendable. The writer also explains what each variable is and how they are manipulated very clearly. The depth of analysis is well-brought out in the detailed explanation for the procedure. More notably, the evaluation and conclusion sections discuss the data in a sophisticated manner. Hence, the level of analysis was very good.

Quality of writing

The writing style of the essay needs some improvement, but there are no glaring errors overall. The presentation of data needs to be better, especially with the consistency of significant figures, use of units for data like degrees Celsius as well as the presentation of graphical and tabular data. Overall, the effort for the content of the report is amazingly well-done, while the presentation aspect could be improved.

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MbT essay summary

Overall, a very substantial effort with evidence that the writer has grasped much of the detailed biochemistry relating to thermal instability of membranes.
There is, however, considerable repetition. The writer needs to adopt a much more concise approach to each section, making it very clear what each sets out to achieve.
There is some confusion over the precise details of denaturation and the properties ascribed to lipids and proteins. Furthermore, a much more disciplined use of the terms reliable, accurate and valid is required at this level.
Overall, however, a very considerable effort (5000 words!) at a notoriously difficult topic.

Marked by teacher Ross Robertson 01/03/2013

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