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Investigating Enzymes and the effects of different variables such as temperature on how they work
- Essay length: 1896 words
- Submitted: 16/07/2011
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Marked by teacher:
Kerry jackson
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Reviewed by:
10/08/2012
Teacher essay summary
An excellent GCSE level experiment report, containing a clear method based on a relevant trial experiment. Results tables, conclusions and data interpretations are clear, and the evaluation is adequate. To improve:
1)Identify the dependent variable, independent variable and control variables clearly
2)Clearly explain why the sources of error that are identified will reduce the reliability of results (eg inadequately cleaned equipment) or the accuracy of readings (eg some oxygen escaping)
3)Think through the method improvements that are proposed more thoroughly. Think about how the sources of error identified could be eliminated and how a more precise conclusion about optimum temperature could be reached
Marked by teacher Kerry jackson 15/02/2012
The first 200 words of this essay...
Investigating Enzymes and the effects of different variables such as temperature on how they work
By Luke Warner
Contents
Introduction
Chapter 1 - Preliminary experiment
Chapter 2 - Method
Chapter 3 - Equipment
Chapter 4 - Results tables
Chapter 5 - Graphs of results
Chapter 6 - Rate of reactions with averages
Chapter 7 - Rate of reactions (averages) graph
Conclusion
Evaluation
Introduction
The aim of this experiment is to study how different variables can affect enzymes. We will be investigating catalase, an enzyme present in peroxisome, which is found in most cells. Catalase is an enzyme that converts hydrogen peroxide into water and oxygen. The word and symbol equations for this are:
Hydrogen Peroxide Water + Oxygen
2H2 O 2H2O + O2
Catalase is essential for organisms because it eliminates harmful hydrogen
peroxide, a by-product of many metabolic processes. Catalase also oxidises some
toxins, namely formic acid, formaldehyde, alcohols and phenols.
Chapter 1 - Preliminary experiment
The experiment
Originally, we performed the experiment by dicing up potatoes, placing them in a
test tube, adding a
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Review of essay
Rating: 4 star(s)
Response to the question
An excellent response to a coursework expected of a GCSE student. Well structured and explains basic science behind the investigation (what catalase is) well and data from table is referred well throughout. To improve briefly explain what is meant by accurate,reliable and outlier. Clearly state different variables using key words (independent, control etc).
Level of analysis
Data is used within coursework to relate to the question although level of analysis is too basic at some parts. For instance when referred to denatured, the student could improve his mark by explaining in detail why enzyme is denatured (referring to optimum temp) to ensure clarity of his point. To further improve, student could create a list of factors affecting experiment (incomplete cleaning of equipment for eg).
Quality of writing
Key words are used well to show students' understanding of topic. Align the text so its easier to follow and understand. Spelling and grammar is good.
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MbT essay summary
An excellent GCSE level experiment report, containing a clear method based on a relevant trial experiment. Results tables, conclusions and data interpretations are clear, and the evaluation is adequate. To improve:
1)Identify the dependent variable, independent variable and control variables clearly
2)Clearly explain why the sources of error that are identified will reduce the reliability of results (eg inadequately cleaned equipment) or the accuracy of readings (eg some oxygen escaping)
3)Think through the method improvements that are proposed more thoroughly. Think about how the sources of error identified could be eliminated and how a more precise conclusion about optimum temperature could be reached
