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Beetroot experiment

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  • Essay length: 1697 words
  • Submitted: 23/04/2009
  • Marked by teacher: (?) Ross Robertson
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AS and A Level Molecules & Cells

Teacher essay summary

3 star(s)

Overall, this report of an investigation into the effect of temperature on the permeability of biological membranes is well-structured with a fair degree of supporting theory. Most of the key areas are covered in a logical order allowing the reader to follow the scientific process. There are, however, a number of weaknesses that would need to be addressed before submitting this as A'Level coursework. [1] The hypothesis needs to refer to the relationship between IV and DV; [2] The introduction needs to be wholly focused on the area of biology under investigation - membrane structure and effect of heat on permeability; [3] Control variables need to be discussed in full with the aim of increasing the validity of the results; [4] The results themselves need to be discussed in the light of sound biological facts with references to previous work by other biologists on the same hypothesis.

Marked by teacher Ross Robertson 15/04/2013

The first 200 words of this essay...

Nanye Osae-Asare

BEETROOT REPORT

PLAN

The aim of the following experiment is to use beetroot to examine the effect of temperature on cell membranes and relate the effects observed membrane structure.

Hypothesis

I predict that upon heating beetroot to a certain temperature colour will leak out and give out a reading on a colorimeter.

Scientific Background

Beetroot is a vegetable which is used greatly in food making and an important ingredient in recipe books. It is usually recommended that you don't remove the outer skin of the beetroot and don't cut off all the stalk and root if you want to avoid getting lots of red dye in the cooking water. Beetroot contains red pigments called betalains, located within the cell vacuole. Normally the pigments cannot pass through membranes but they leak out when the beetroot is cooked or put in alcohol. The beetroot is protected by a cell membrane.

The cell membrane functions as a semi-permeable barrier, allowing a very few molecules across it while fencing the majority of

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MbT essay summary

Overall, this report of an investigation into the effect of temperature on the permeability of biological membranes is well-structured with a fair degree of supporting theory. Most of the key areas are covered in a logical order allowing the reader to follow the scientific process. There are, however, a number of weaknesses that would need to be addressed before submitting this as A'Level coursework. [1] The hypothesis needs to refer to the relationship between IV and DV; [2] The introduction needs to be wholly focused on the area of biology under investigation - membrane structure and effect of heat on permeability; [3] Control variables need to be discussed in full with the aim of increasing the validity of the results; [4] The results themselves need to be discussed in the light of sound biological facts with references to previous work by other biologists on the same hypothesis.

Marked by teacher Ross Robertson 15/04/2013

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