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This piece of coursework is about the enzyme catalase. Enzymes are used all over the body for different jobs such as the breaking down of food. I did an experiment to find out at what temperature did the most activity happen.

Extracts from this document...

Introduction

Yr 10 Science Coursework By Anonymous Table Of Contents Introduction 3 Planning 4 Research 5 Predictions 7 Procedure 9 Fair Test 10 Safety 11 The Experiment 12 Results/Conclusion 13 Evaluation 15 Equipment Used 15 Method 15 Analysis of the results obtained. 16 Were my predictions right? 16 What I learned from the experiment? 16 Introduction This piece of coursework is about the enzyme catalase. Enzymes are used all over the body for different jobs such as the breaking down of food. I did an experiment to find out at what temperature did the most activity happen. From the experiment I will need to produce a table of results with at least six different temperatures. I will need to plot a graph with those six results to get a good enough reading to construct a graph that will make sense. In my coursework I will need the following information: - > I will need to record what research I did to find out about enzymes, what information I obtained about them and where did I get the research. > I will have to write about the predictions that I made for the experiment and comment on the reasons for picking those predictions. > I will need to explain whether it was a fair test or not. If so, how did I make it a fair test? How did I ensure that all the equipment was suitable to give each set of results an equal chance? > What safety procedures did I carry out? How did I make it safe so that once I was involved in the experiment I would not need to be concerned with safety issues? ...read more.

Middle

2. I think that the experiment will work best at 37�C. I have said this because 37�C is usually the temperature of body heat. With catalase being an enzyme in the body it will be designed to work best at body temperature, this is my reason for picking this prediction. I have drawn a graph of what I think will happen at the end of the experiment for this prediction. This graph of prediction 2 could do two things so I have drawn them both on, labelling them 1st possibility and 2nd possibility. Procedure Fair Test I made my experiment a fair test by doing different things. In the following information it will explain how I made it a fair test and why did the procedure made it a fair test. Here is a list of how I made it a fair test:- > I used the same amount of H2O2 - which was 50cm� - so that I gave each experiment a fair chance to give off possible different readings, but in the same procedure. > I used the same amount of potatoes. The length for each potato was 41/2 cms and I used three of them. I made sure that they were all the same length by measuring them with a ruler. I made sure they were all the same thickness by cutting them with a cork borer. > I also used the same amount of time in each experiment to see how much oxygen would be captured from the potatoes. Five minutes seemed a sufficient amount of time because its not too short so that insufficient oxygen would be caught and not too ...read more.

Conclusion

Analysis of the results obtained. The results I obtained the first and second time I did the experiment were not how I would have liked them to be. The first set of results were not very accurate and didn't show any relationship between them at all. They were all over the place. The second set of results was better but again not acceptable for what I wanted to do with them. The third set of results were the best because they showed the amount of oxygen given off increasing, peaking and then decreasing. There were two results that didn't quite meet my expectations so I decided to repeat those ones. I got good enough results from those minor tests and was able to produce a really good set of results, which means that I will be able to produce an accurate graph with at least six points. Were my predictions right? When I compared my predictions with my results it seemed that my second prediction was right. The graph of my results did peak at around the 37�C but then dropped, which is what I said would happen on the second possibility that I drew on the graph titled prediction 2. What I learned from the experiment? The things I learned from this experiment are:- > Perseverance, if something happens differently than what you had planned, keep trying and eventually you get what you had hoped for. > If you put your mind to it you can produce a good set of results, graph and a good piece of coursework. > Safety comes first in every experiment that you do. > It helps to plan everything before you do it. Exctracted from Compton's Interactive Encyclopedia. Yr 10 Science Coursework Page 7 of 18 ...read more.

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