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In this essay, I will be stating the factors affected by enzymes, the purpose of enzymes, and finally, the uses of enzymes.

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Introduction

In this essay, I will be stating the factors affected by enzymes, the purpose of enzymes, and finally, the uses of enzymes. What are Enzymes? Enzymes are biological catalysts. They have enormous catalytic power. Catalysts are substances that speed up reactions without being used up. Enzymes help the reactions that occur in our bodies by controlling the rate of reaction. Enzymes are also important in respiration. Aerobic respiration releases energy from glucose. Most enzymes are made of proteins. They are made up of long chains of amino acids and also has a unique shape, as shown in the picture opposite. The purpose of this is to allow another molecule to fit with the enzyme. ...read more.

Middle

Enzymes don't just have an optimum temperature; they also have an optimum pH. These diagrams will illustrate the optimum temperature and optimum pH of certain enzymes. What factors affect enzymes? The three factors affecting enzyme activity are: pH, temperature and substrate concentration. Temperature is crucial for enzymes as no activity would take place if there is low temperature. The temperature for enzymes to work at their full potential, it should be around 38-40�, this way, reactions would take place more successfully. The second factor affecting enzymes is the pH. The pH depends on where the enzyme is situated. The average pH for enzymes to work at their best is around 7.5-8 pH, but depends on where the enzyme is. ...read more.

Conclusion

Enzymes are present in photosynthesis in plants. Enzymes are also present in aerobic respiration, were it converts glucose into energy. Here is the equation for aerobic respiration: Glucose+ Oxygen= Water+ Carbon dioxide (+energy). Most reactions take place in cells, were different enzymes carry out different chemical reactions. Enzymes play a major part in our lives, without it, we wouldn't survive. To Conclude... Enzymes are situated all over our bodies. They are made out of long chains of amino acids, which mean that they are proteins. Enzymes never die, they denature. This is because their active site has changed, due to excessive temperature or the exposure to wrong pH. According to where the enzyme is in the body, it will be working at that optimum temperature/ pH. ?? ?? ?? ?? Enzymes: By Rahma Hussein Year 11 Rahma Hussein ...read more.

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Response to the question

Though the candidate has included an introduction it is very brief and there is some room for improvement. Firstly the candidate states that they will look at ‘factors affected by enzymes’ which is grammatically incorrect, it should be ‘factors that ...

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Response to the question

Though the candidate has included an introduction it is very brief and there is some room for improvement. Firstly the candidate states that they will look at ‘factors affected by enzymes’ which is grammatically incorrect, it should be ‘factors that affect enzymes’ you need to be careful that you get this the right way round. Secondly, your introduction needs to be more than a statement of what you plan to discuss, you should give a brief outline of your topic and you should think about ways in which you can make your introduction interesting so that you catch the attention of the reader. This is important as it makes it more likely that they will read all of your work rather than simply skim though it. As long as it is relevant you can do anything to try and engage your reader, you could start with a question, you could give a controversial statement or you could include a quote or fact that you find interesting.

Level of analysis

The candidate demonstrates a good understanding of this topic and their analysis is strong. They provide a good level of detail when discussing factors that affect enzyme activity. That said, there are a few ways in which the candidate could have improved the quality of their work. When writing a biological essay you often have the opportunity to go beyond the set topic and link together other key ideas, this shows that you have a broader range of knowledge and this can help you obtain a higher grade. There are many areas of biology you can discuss as enzymes have many different purposes, for example you could talk about protein structure as enzymes are a type of protein or you could discuss the process of digestion in which enzymes have an important role. On another note, though I approve of the use of images within an essay as they can help discuss concepts that are difficult to visualise, you need to be careful when placing images into to your work. You need to make sure that images don’t overlap and cover text and that your they don’t detract from what you have to say. In addition to this if you use images from the internet you need to state the sources you have used and to provide links to the webpages in which you copied the images from. Finally, the candidates conclusion could be improved by summarising the key points form within their essay with reference to why this are important, this helps to tie together any loose ends and bring your essay to a close.

Quality of writing

This is a well written piece of work, the candidate demonstrates a good understating of the topic and they have used appropriate scientific terms throughout. In addition there are no spelling errors and only one or two issues with grammar. If your worried about making these kinds of mistakes you can always ask a teacher or parent/guardian to help check over your work.


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Reviewed by pictureperfect 31/07/2012

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