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

An investigation into the optimum conditions for the anaerobic respiration of Yeast (fermentation).

Extracts from this document...

Introduction

An investigation into the optimum conditions for the anaerobic respiration of Yeast (fermentation). By Ben Bravington-Sim Introduction To Anaerobic Respiration Bacteria, yeasts and root cells of plants can also change from aerobic respiration to anaerobic if they are short of oxygen. Certain bacteria live permanently without oxygen: in fact oxygen is poisonous to some of them! Yeast cells use anaerobic respiration to convert Glucose in to ethanol and carbon dioxide, with the release of energy. The reaction, called fermentation, is used commercially for the production of ethanol (alcohol) by yeast. Glucose Ethanol + Carbon Dioxide C6H12O6(aq) 2C2H5OH(aq) 2CO2(g) Energy release = 1.17 kJ/g glucose The energy released is less than in aerobic respiration. ...read more.

Middle

2. Set up apparatus as shown above. 3. Draw up a table showing temperature, Volume of CO2 given off in 6 minutes. 4. Use the water bath to heat the mixture to 23oC, remembering to remove the mixture from the water bath before heating the water. 5. Place the mixture back in the water bath and wait for the mixture to heat up to 23oC. 6. When the mixture has acquired the desired temperature start the timer. 7. Record readings from the gas syringe every minute for 6 minutes. 8. Stop the timer and reset both the timer and gas syringe. 9. Repeat stages 4-8 for the following temperatures 33, 38, 43, 46. ...read more.

Conclusion

As you can see the as the temperature rises the volume of carbon dioxide goes up slowly until the optimum temperature. On the other hand after the optimum temperature the volume of carbon dioxide drops quite rapidly. In other words the enzymes catalyze the reaction. This catalysts work faster and faster until the optimum temperature when the active sight is denatured or deformed and less of the catalysts work which is why after the optimum temperature the volume of CO2 drops rapidly. Conclusion I conclude that the optimum temperature for the anaerobic respiration for yeast is 43oC this co-insides with my hypothesis. The shape of the graph is curved. The curve does not have a line of symmetry signifying that the enzymes are slow in terms of temperature to speed up the reaction compared with the rate that they denature. ...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 Humans 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 Humans as Organisms essays

  1. Marked by a teacher

    The effect of different sugar substrates on the rate of yeast respiration

    4 star(s)

    Also because it is a disaccharide it will take time to be hydrolysed into monomers before it can start respiration I expect Fructose, lactose and Galactose to be the slowest from the other sugars. This is because they are not common respiratory substrates and so they shape is not specific to the enzymes involved.

  2. Marked by a teacher

    An investigation into the effect of temperature on the rate of respiration in yeast

    4 star(s)

    To ensure my results were reliable I will do 3 repeats in total of the same temperature. If the results look similar enough I can assume they are reliable and I will keep them. If they do not, I will redo them until they look reliable.

  1. An experiment to investigate the rate of anaerobic respiration of yeast in various respiratory ...

    To keep the temperature constant, I will use a kettle and tap water in order to keep the temperature constant at 30 degrees Celsius (3rd bullet point in justification). To check the temperature remains at 30 degrees Celsius I will use a thermometer to constantly make sure the temperature remains

  2. Stem Cell Research

    Therefore, people against stem cell research argue that the destruction of embryos is the killing of human life (i.e. murder). George W. Bush is against stem cell research, and restricted it incredibly when he was in presidency. Bush's decision to restrict stem cell research was because of his belief that

  1. Investigating the effect of temperature on yeast respiration.

    I decided I will use a burette in my experiment, because these pieces of apparatus are designed to collect gas, they have measurement markings on, and therefore the readings can be easily taken. The burettes are also within my price range and are available for use.

  2. An Investigation into how the anaerobic respiration of glucose and yeast is effected by ...

    This ensures it is a fair test as the glucose and yeast mixture starts from exactly the same state as it did before and the water is clean and ready to be heated again. 8) This time, boil the kettle.

  1. Potato and Osmosis Investigation

    tests more longer * Length of time of each trials - I will have to leave the potatoes in the beaker for a certain length of time to actually allow the process of osmosis to take place * The health and age of the potato - might affect the experiment

  2. My aim is to find how temperature affects the rate of anaerobic respiration in ...

    * Air may become trapped between the oil and the yeast making the reaction aerobic. Bubbles: * The person could miss-count the bubbles. * The bubbles may be of different sizes. * Air may become trapped between the oil and the yeast making the reaction aerobic.

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