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

Investigation to Find the Optimum Rate of Anaerobic Respiration in Yeast.

Extracts from this document...


Investigation to Find the Optimum Rate of Anaerobic Respiration in Yeast By James Taylor 10MA Plan I plan to find the optimum rate of anaerobic respiration in yeast by setting up an experiment where the yeast is heated in a glucose solution. When the yeast is heated it gives off gas so I will measure the amount of gas given off for my results. I plan to do my experiment safely by firstly wearing safety goggles. When using the apparatus I will use a heat proof and leave the Bunsen burner on the safety flame when I am not using it. I will make my experiment a fair test by keeping the following variables the same: the volume of water in the water bath, the amount of yeast and the volume of glucose solution used in the heated solution and the time the solution is left in the water bath. I predict that as the temperature of the solution is increased the collision rate of enzymes will increase with the substrate until it reaches its optimum temperature, which is when the denaturing will start to take place. ...read more.


The variable I will be changing is the temperature that the solution is heated to. I will be taking results at different temperatures these temperatures are 20�C, 30�C, 45�C, 60�C and 90�C. I will take each observation over 5 minutes recording how many bubbles are produced, and then I will find the average bubbles per minute. Analysis In my experiment I followed all the safety guidance's as I had laid out in my plan. From my results I can see that I have achieved enough results to give a reasonable answer the question. My Results Temperature (�C) Bubbles After 5 min 20�C 0 30�C 13 45�C 44 60�C 31 90�C 12 Averages Temperature (�C) Bubbles per Minute 20�C 0 30�C 2.6 45�C 8.8 60�C 6.2 90�C 2.4 I do think my results are reliable, as we had done preliminary practise experiments in which we could correct any mistakes we were making. If I could do the experiment again I would change the range of results slightly I would do a broad range at first, then followed by a narrower range nearer to where it looks like the optimum temperature would be. ...read more.


Evaluation Overall I think my experiment went really well but smaller changes could have been made which would make the results and the experiment more accurate. My results were quite good but probably not the best I could of achieved. The first set of the ones taken at 20�C could have been better, but as they were the first real ones we did something was bound to go wrong. Overall our results are pretty reliable as they stick to the right pattern. I don't think we got any very unusual results but , as I said the first set was slightly odd in that no bubbles were produced. I think this was because we had the delivery tube at a funny angle and so the gas was unable to get out. If I was to do the experiment again I would make several changes. These would be to set up the equipment very accurately to get the best results possible. Also to make both and wide and narrow range of results to find an accurate optimum temperature. I think those would be the only things major I would change as I was quite pleased with everything else. ...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 Green Plants as Organisms 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 Green Plants as Organisms essays

  1. Peer reviewed

    Plan for Anaerobic Respiration in Yeast

    4 star(s)

    The equipment will be set up as shown 2.) 50ml of water will be taken from the 40 C water bath and allowed to cool until it reaches 20 C. 3.) 3 grams of sugar, 1.5 grams of yeast and the 50ml of water will be put in the test

  2. The effect temperature has on the rate of anaerobic respiration in yeast.

    Do the test three times for each of the temperatures 25c, 37c, 50c, 72c and 80c. Fair Test: I have ensured that my experiment is a fair test by: * Doing each experiment three times for each temperature * Measuring the Carbon Dioxide in a measuring cylinder instead of counting the bubbles.

  1. What is the effect on the rate of respiration of yeast cells with glucose ...

    Residues that have been left over from previous experiments will have been removed. Hot water from a kettle would be poured into the water bath to raise its temperature, so it will be ready for the next temperature under which the experiment will be carried out.

  2. The investigation is aiming to look at transpiration.

    When you look at the calculations, you notice that the leaf surface is for the mesophyte is larger than that of the xerophytes. This means that the rate of transpiration in mesopyte will be higher than that in the xerophytes.

  1. An Investigation into Species Diversity with distance along a Pingo.

    Ladies bedstraw has thin spike-like leaves. Each leaf therefore has a small surface area and so transpiration cannot efficiently occur. Ladies Bedstraw is adapted to conditions of water shortage. This is evident from the kite diagram of its distribution, which illustrates that it is mostly present in the upper parts

  2. An investigation of the factors that affect the rate of respiration in Yeast.

    From the preliminary investigation I have chosen to use 20cm� of yeast and 10cm� of glucose. I shall only ever fill the water bath with 200cm� of water. I shall only use 5cm of hydrogen carbonate solution. The temperatures, which I shall be using, are 19�C, 29�C, 37�C, 45�C and 55�C.

  1. Investigating respiration in aged yeast

    Risk assessment The apparatus and the method is relatively safe, but the only area of concern is that the most parts of the apparatus are made of glass, so I should be careful not to break any, or if this happens to remove the broken glasses with caution.

  2. What Is the Optimum Temperature Of Respiration?

    The solution will be then mixed and put in the syringe. 3. The syringe will then be placed in the troth at the temperature of the water at 30c this will be repeated with the temperatures 40c 50c 60c and 70c.

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