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Catalyse Investigation

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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.


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.


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.

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  1. Marked by a teacher

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

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    will take place as molecules must collide in order to for a reaction to take place. This means that a reaction is more likely to take place, in a shorter time, making the rate of reaction quicker. More collisions are needed because only one in every 10 to the 14 collisions lead to a successful reaction taking place.

  2. The effect of substrate concentration on the activity of catalyse.

    The enzyme concentration will be kept constant, as I will be measuring 5cm� of potato solution each time. The potato will be liquidised therefore reactions should occur faster as the molecules will around more faster. The potato is the source of enzyme (catalyst).

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