• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

Extracts from this document...

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Life Processes & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a star student thought of this essay

3 star(s)

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 ...

Read full review

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.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by pictureperfect 31/07/2012

Read less
Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Life Processes & Cells essays

  1. Marked by a teacher

    Plan: The effect of the end product, phosphate, on the enzyme phosphatase

    5 star(s)

    Repeats of the experimental: To ensure that all the reactions are carried by the same enzyme, the enzyme suspension added to each test tube must from the same extract of potato. So the amount of enzyme suspension will limit the number of repeat experiments.

  2. Marked by a teacher

    Biology Coursework Enzymes

    4 star(s)

    * Finally I will add two drops of the starch/amylase solution every 30 seconds to the next well until there are no remaining wells. Results With the results I got I was able to draw a table, which displays the resembling colours of the starch and amylase solution reacting with

  1. Industrial & Commercial Uses for Enzymes

    The specific types of enzymes which are used in cheese are proteases, lipases, and catalases. Proteases are primarily used because milk naturally contains a protein called caseins which retain the liquid form. The proteases are added to hydrolyze these caseins so the milk is stabilized in liquid form.

  2. The Nervous System

    o Usually long. ? Myelin Sheath: o Layer of fatty substance that encloses many nerve fibers. o Insulates the axon. ? Nodes of Ranvier: o Regions on axon where myelin sheath is absent. Myelin sheath is secreted by cells of Schwann. They surround the sheath.

  1. Investigation Into Trypsin Activity

    Other methods included making your own judgement when the mixture was clear, but this was not very accurate. Variables Independent variable: * Enzyme concentration Dependant variable: * Time taken for mixture to become transparent Controlled variables: * Enzyme temperature * Volume of milk * Stirring * pH There were controlled

  2. Investigating an enzyme-catalyzed reaction

    of equipment I will be using and the way I will perform my experiment. Firstly I needed to choose the source of the catalyse, because without the catalyse there is no experiment. At first I tried to run an experiment using small amounts of potatoes, however I felt that this

  1. The Action of Enzymes

    of another, the shape of the active site will be different, and the substrate will not be able to fit in it, and the reaction will not take place. This is why enzymes are called specific. As with all chemical reactions, when the temperature increases, the rate of reaction also increases.

  2. Catalase and Enzymes Investigation

    I predict that the higher the concentration of catalase, the higher the volume of oxygen produced. This will happen because Catalysts are molecules which speed the rate of reactions so the enzyme (catalase) in the potato or liver breaks down Hydrogen peroxide.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work