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

Catalyse Investigation

Extracts from this document...

Introduction

Catalyse is an enzyme that breaks down hydrogen peroxide into water and oxygen. Hydrogen Peroxide Water + Oxygen 2H2O2 2H2O +O2 The factors that affect enzyme activity are: � Enzyme concentration (Gareth Williams, Biology For You page 31) � Substrate concentration (Mary + Geoff Jones, Biology page ) � Temperature (Gareth Williams, Biology For You page 31) � pH (Gareth Williams, Biology For You page 31) Background Information Enzymes such as catalyse are protein molecules, which are found in living cells. They are used to speed up specific reactions in the cells. They are all very specific as each enzyme just performs one particular reaction. Catalyse is an enzyme found in food such as potato and liver. It is used for removing Hydrogen Peroxide from the cells. Catalyse speeds up the decomposition of Hydrogen Peroxide into water and oxygen. It is able to speed up the decomposition of Hydrogen Peroxide because of the shape of the Hydrogen Peroxide molecule. ...read more.

Middle

I will be using pureed potato to provide the enzymes for this experiment. This is the best kind of potato to use because it has more surface area than whole potatoes and this means more active sites for the substrate to react with.I will be change the enzyme concentration(amount of pureed potato) in order to measure its effects on the rate of catalyse activity. I will perform the experiment using 0cm3, 1cm3, 2cm3, 3cm3, 4cm3, 5cm3 of pureed potato. In order to make it a fair test I must keep the volume the same for each test. The set volume will be 5cm3 so I will use water to keep the volume at 5cm3, this means that for example when I do the experiment with 3cm3 of pureed potato I will add 2cm3 of water. I will add 5cm3 of hydrogen peroxide each time in order to keep the test fair. ...read more.

Conclusion

The higher the enzyme concentration was, the more oxygen was produced. This is because the with higher enzyme concentration, there are more active sites where more successful collisions will take place between the active site of the enzyme and the substrate. The graph shows that as the enzyme concentration was increasing more and more, the rate of catalyse activity was increasing less an less which indicates that it was nearing the optimum rate of catalyse activity. Evaluation My experiment worked well although if I were to do it again I could do certain things differently in order to gain more accurate results. I would repeat the experiment more times as this would give me a more accurate average and I would also uses more different values in order to get a more detailed outlook on how enzyme concentration affects the rate of catalyse activity. I would also use a measuring syringe to measure the amount of oxygen because this is a much more accurate way of doing it. ?? ?? ?? ?? ...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

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

    Investigating the breakdown of hydrogen peroxide by the enzyme catalyse in potatoes.

    4 star(s)

    Also to further improve a 25cm3 measuring cylinder could have been used for more accurate results. Another way in which the accuracy of the results could have been improved would have been to record for an even shorter period of time - perhaps 90 seconds, and use the extra time

  2. Osmosis Investigation

    These two graphs may be superimposed on one. This is shown on the graph on the next page. In this case, both graphs cross the x-axis at different points, indicating that the potatoes have different cell sap concentrations. Nevertheless, the points at which the graphs cross the x-axis is relatively

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