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

Does temperature affect how well enzymes work?

Extracts from this document...


Does temperature affect how well enzymes work? Aim To investigate whether the enzyme Catalase is affected by different temperatures by using catalase from potato at a range of different temperatures and to measure how enzyme has worked by measuring the amount of oxygen collected Introduction * Living cells continuously carry out chemical reactions and as a by-product produce hydrogen peroxide. It is a toxic substance which can destroy the cells if not immediately broken down. * This breakdown is carried out by the enzyme catalase, which is produced in all living cells. * Catalase breaks down the hydrogen peroxide into water and oxygen making it harmless to the cells. Hydrogen CATALASE Peroxide Water + oxygen 2H2O2 2H2O+ O2 Therefore enzyme catalase is the catalyst. Hydrogen Peroxide is the substrate. Catalase is the fastest enzyme known. When it comes into contact of Hydrogen peroxide, frothing shows rapid production of oxygen. . Catalase is to break down. This is what enzymes do. Catalase is the name of the enzymes I am studying. ...read more.


* Concentration of hydrogen peroxide * Source of potato will be the same or the test would be unfair. How does the enzyme work? Thousands of chemical reactions take place in living cells to keep them alive. Enzymes make these reactions happen much faster. Chemicals which speed up reactions are called catalysts, and since enzymes work in living cells, they are called biological catalysts. Enzymes work on substances called substrates. The substrates attach to the active site of same shape and thus a reaction takes place. All enzymes have some important properties: * They are all proteins. Hence they have a specific shape. * Specific enzyme controls one particular reactions (it is specific) * They can be used over and over again. Hence they are economically viable. * They are affected by changes in temperature, and each will have its own optimum temperature. * They are affected by changes pH (how acidic or alkaline) and each will have its optimum pH. * They can be destroyed (denatured) by heating (boiling). ...read more.


This would reduce the amount of O2 in the measuring cylinder. 2. Some of the grated potato produced quite a lot of foam which rose in the delivery tube with the oxygen. This made it difficult to read the volume of oxygen in the measuring cylinder. 3. My delivery tube was made with 2 parts joining them with a rubber tube. During some experiments this came apart and might have affected my experiment. 4. In my experiment there were some results (anomalies result(s) highlighted with black colour ) Temperatures in � C Experiment 1 Experiment 2 (repeat) Average Experiment 3 (teacher's result) 0 5 30 17.5 6 24 22 40 31 13 40 35 45 41 41 60 10 10 31 31 80 3 3 3 5 This is out of line with my prediction. I expected the volume of oxygen to be the greatest at the range of about 40� C and lower at the cold and hot temperatures. It was but 30 ml of 02 is quite high. How ever my average results followed same pattern as my teacher's result, and so safely I can say that my results match with my predictions ?? ?? ?? ?? GCSE Biology coursework. - 1 - By Rushal Raghwani 11P ...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

    Biology Coursework Enzymes

    4 star(s)

    * When the temperature of the amylase reaches 30?C I will take the boiling tube out of the hot water bath.

  2. Enzymes experiment. Do enzymes work faster or slower when the temperature is high?

    We must always wear goggles because if the protease splatters anywhere then it can cause a lot of damage to your eyes so it's always valid that we wear safety goggles. I will use at least 15 Protein strips this is the main focus and will act as the enzyme.

  1. The Action of Enzymes

    I will use 4g in 100cm3 water Trypsin (enzyme) solution - this will be the enzyme which will act on the substrate. I will use 0.5g in 100cm3 water.


    fit into a special slot (space) in the enzyme molecule: the active site. A chemical reaction takes place at this site and the products are released, leaving the enzyme unchanged and ready for re-use. Below is a more detailed explanation. Enzymes are globular proteins; their molecules are round in shape.

  1. Science Enzymes Coursework

    As a rule, enzymes do not attack living cells. As soon as a cell dies, however, enzymes that break down protein rapidly digest it. The resistance of the living cell is due to the enzyme's inability to pass through the membrane of the cell as long as the cell lives.

  2. Investigating the properties of enzymes.

    Enzymes can be used again and again because they are unchanged after a reaction. 7. The more substrate there is the more reaction will occur. 8. The more enzyme there is the faster the rate of reaction. Enzymes can also be used in our daily life.

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