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The effect of temperature on the permeability of beetroot membrane

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  • Essay length: 3105 words
  • Submitted: 24/04/2009
  • Marked by teacher: (?) Ross Robertson
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AS and A Level Molecules & Cells

Teacher essay summary

3 star(s)

A very lengthy report dictated by a very rigid framework of imposed headings that were unquestionably very unhelpful. They interrupted the normal flow of information and led to considerable repetition.
The writer has not always grasped the meaning of key words - reliability, accuracy and validity.
A risk assessment was not carried out and control variables were given rather short shrift.
In view of the absence of individual and class data, it is difficult to assess the validity of the overall investigation. Nonetheless, within the constraints placed upon the writer, this report reflects a very significant effort.

Marked by teacher Ross Robertson 01/03/2013

The first 200 words of this essay...

The effect of temperature on the permeability of beetroot membrane

A1: Develop a hypothesis

* What do you understand to be the nature of the problem?

Beetroot contains pigments called betalain pigments which give them their distinctive red colour. This pigment is found in the vacuole of the beetroot and in order to release it the vacuole must be broken down. In order to break the vacuole down I am going to use heat shock. When treated with heat the phospholipid bilayer becomes damaged and turns into fluid. When treated with heat the beetroot membrane will break down releasing the red betalain pigments.

As I use different levels of heat shock the amount of betalain released should be relative to the increase in temperature. Therefore in theory the higher the temperature the more betalain pigment released so the redder the sample.

* Outline the biological basis of the problem

As I am using heat shock the cell membrane will become damaged. When cell membranes become damaged they release the contents of the cell in this case betalain. The cell membrane of beetroot is composed of a phospholipid bilayer. This bilayer

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MbT essay summary

A very lengthy report dictated by a very rigid framework of imposed headings that were unquestionably very unhelpful. They interrupted the normal flow of information and led to considerable repetition.
The writer has not always grasped the meaning of key words - reliability, accuracy and validity.
A risk assessment was not carried out and control variables were given rather short shrift.
In view of the absence of individual and class data, it is difficult to assess the validity of the overall investigation. Nonetheless, within the constraints placed upon the writer, this report reflects a very significant effort.

Marked by teacher Ross Robertson 01/03/2013

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