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

Anaerobic Reaction of yeast

Extracts from this document...


P O A E SPaG TOTAL Assessment Title Anaerobic Reaction of yeast_ Date _06/17/01 Candidate's name_______MichaelAkers______________________________________________ Candidate's Number _____________________________________ Centre Number 58615 I am going to investigate the anaerobic reaction of Yeast. Anaerobic respiration requires: Glucose ==> Co2+Alcohol. Whilst Aerobic respiration, which we use to breathe, requires: Glucose + Oxygen ==> Co2+H20+ heat energy. To observe and record results of this reaction I will measure the amount of Co2 this experiment produces. There are a number of variables I need to consider beforehand that could dramatically affect my experiment. I have also made predictions where appropriate Temperature This can make the rate of reaction speed up or slow down. It will noticeably slow down the reaction when the water is cooled. But the Yeast will speed up until a point where it cannot survive anymore. I would expect my graph to show the Yeast speeding up and then dying. As I heat the water, the particles start to move faster, this makes them collide at a faster speed, speeding up the rate of reaction. Amount of Yeast I will keep the amount at a constant by using a test-tube to measure out an exact amount. ...read more.


Put a bung and pipe in the end ? fill the beaker with water to the right temperature ? Fill graduated tube water ? Put the tube into the test-tube ? Put the boiling tube in the beaker ? Leave for 3mins to get to temperature ? Time for 5mins ? Measure amount of Co2 produced. ?Then I will alter to a different temperature in this case my temperature is altering 10 each time so I will use the kettle to alter this temperature making sure it is the right temperature by using a thermometer. ?I will use the same amount of yeast for each 'run' to eliminate solution variation. As I am obtaining these results, I will make sure I use the correct amount of ingredients and make sure I keep my variables (i.e. amount of yeast the same throughout experiment) to what I have predicted they should stay at in experiment. I will record my results in a table as underneath, but I may need to repeat some results, if they look out of place when compared to my results or conclusion. Temp Time Run1 (cm) Run2 (cm) Average (cm) 20 5mins 30 5mins 40 5mins 50 5mins 60 5mins 70 5mins 80 5mins Obtaining evidence After I conducting my experiment to record my ...read more.


I think that I can form the conclusion that 'the yeast can only perform anaerobic respiration past a certain temperature (20) and under a certain temperature (80)'. As temperature was my chosen variable to alter and measure this is what I have discovered. I think if I could extend my study of this I could make changes to keep in my experiment set up to keep nearly all my variables at a constant, e.g. I could use a more reliable source of heating the water other than a kettle, this would greatly improve the reliability of the experiment, I may get more accurate and even better results than I have now by taking recordings of the Co2 in the yeast every 5 degrees, this would give me a better indication of whether the results are on course to being accurate and I could have a better chance at pin pointing when Co2 stops being produced. I think I experiment was a success I have spotted when the yeast stops anaerobically reacting and when it starts anaerobically reacting. I have found out that the enzymes in the yeast start to rapidly speed up when they are heated but too much heat will kill them as we have seen in my experiment. ****************************** Page 1 ...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)

    This is a diagram representing the way the zymase works. The substrate (shown in blue) fits perfectly into the active site of the enzyme (the red line). Then the reaction takes place, the reaction cannot take place if the substrate does not fit the active site perfectly.

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

    corresponds to a small uncertainty, or error within the results making them more accurate and reliable. The rates of reaction were calculated from each graph drawn using the results from the actual experiment. Drawing a tangent to the curve at any point where the curve was smoothly drawn did this.

  1. Investigating respiration in aged yeast

    At the beginning my water bath was in a 100 ml conical flask, but I realized that the temperature was very hard to control (dropped rapidly) and I had to add warm water every two minutes, so I changed the conical flask with a larger one, of 250ml.

  2. How did Leamington develop into a typical spa town of the mid nineteenth century?

    In Cheltenham there weren't any baths due to the results of the water constantly drying up. Baths were one of the main features of a spa town, as people would come and cleanse their bodies in this "blessed" water. Bath would have gained the most tourism due to Queen Mary

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