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Beetroot Practical Write up

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  • Essay length: 5905 words
  • Submitted: 12/05/2009
  • Marked by teacher: (?) Ross Robertson
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AS and A Level Molecules & Cells

Teacher essay summary

3 star(s)

Overall, this is a very considerable effort on the part of the writer. A great deal of thought has been put in to the overall structure of the report. A lot of experimental work was carried out, notably a very thorough preliminary investigation which proved very valuable.
The only major weakness lies with the analysis of the data collected. This is a very common issue with A'Level assignment reports. IV/DV trends should have been discussed in detail with reference to data points on the graph. Any SD calculations could then have been used to examine the reliability of the final data.
The evaluation section was thorough, but it is important to assess the validity of data by examining in detail whether all the control variables were indeed controlled (kept constant). In practice, this is very hard to do.
Despite these misgivings, this is an impressive piece of work.

Marked by teacher Ross Robertson 01/03/2013

The first 200 words of this essay...

Biology Coursework

Beetroot

Hypothesis: To investigate the effect of different concentrations of ethanol on the permeability of beetroot cell membranes.

Prediction: By exposing a membrane to a solvent, ethanol, it will affect its permeability. Therefore higher the concentration of the solvent, the more permeable the membrane will be. But by increasing the concentrations of the ethanol beyond a certain point it may have no affect on the cell membrane because the ethanol would have broken down the cell membrane completely. This is because of the effect of ethanol on the lipids in the membrane. Also, more dye would be present as the lipids are essential to the structure of the cell membrane as they control the substances that enter and leave the cell. Ethanol could also destroy some the proteins or denature the structure because protein has a tertiary structure. The ethanol would destroy the hydrogen bonds that hold the protein structure. Therefore, with the lipids and proteins destroyed in the cell membrane, the pigment is allowed to escape from the cell due to there being no cell membrane holding substances in the cell.

Scientific Knowledge:

Transfer across cell membrane structure:

There are

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MbT essay summary

Overall, this is a very considerable effort on the part of the writer. A great deal of thought has been put in to the overall structure of the report. A lot of experimental work was carried out, notably a very thorough preliminary investigation which proved very valuable.
The only major weakness lies with the analysis of the data collected. This is a very common issue with A'Level assignment reports. IV/DV trends should have been discussed in detail with reference to data points on the graph. Any SD calculations could then have been used to examine the reliability of the final data.
The evaluation section was thorough, but it is important to assess the validity of data by examining in detail whether all the control variables were indeed controlled (kept constant). In practice, this is very hard to do.
Despite these misgivings, this is an impressive piece of work.

Marked by teacher Ross Robertson 01/03/2013

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