Stephanie Ashton 11/11/07
An Essay On ‘The Various Roles Played By Proteins
In The Cell Membrane.’
Throughout this essay I am going to be investigating the different types of proteins found in the cell membrane, and why their functions are important in everyday life. Proteins make up about half of the mass of the cell membrane and are responsible for most of the membrane’s properties. On average a cell has about ten thousand different types of proteins within it, therefore each of these different types need to be localised to a specific area in order for them to do the job at hand adequately.
Proteins which are known as membrane proteins can be split into two groups; the first of these groups is known as the ‘extrinsic proteins’ and the second is called the ‘intrinsic proteins’. Extrinsic proteins can only be found on one side of the phospholipid bilayer, they do not alter the movement of substances and combine with specific substances which have a complimentary shape to their own; therefore act as receptor site. Intrinsic proteins lie across the whole membrane. They help ions and molecules which are water soluble to cross the membrane at this point, therefore controlling what goes into and what comes out of the cell.
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Peer Reviews
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Quality of writing
Spelling, punctuation and grammar are all adequate and correct but the essay could be organised better, and references should be included in their own separate section at the end of the text.
Level of analysis
Introduction is good, but could set out the main examination basis of the essay better rather than concentrating on broad points about proteins. Language used is basic scientific A level terms that from the beginning stick to the syllabus and the basic sciences used at A level rather than scoping above and beyond. Link structure to function vaguely and makes a few points although they could make a few more real life examples. Do not include a conclusion for the essay and could include a lot more in depth analysis.
Response to question
Overall a mediocre essay that outlines all the basic A level facts for this level of syllabus. Introduction could be more centered around the question, and the main analytical body of the text could be a lot more in depth and explore topics of proteins around the a level syllabus to gain a higher mark. No conclusion. Response to the question is very scientifically accurate although basic.