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

Investigation into the alcohol fermentation of yeast

Extracts from this document...

Introduction

Investigation into the alcohol fermentation of yeast Aim: To find out about the products of alcoholic fermentation. We are trying to see if yeast can respire anaerobically at different temperatures. Before I begin the experiment i am going to explain the main facts of this study. Background information: Aerobic respiration is when something respires with air, whereas, anaerobic respiration is when something respires without air. Most organisms will die without oxygen but in some cases, glucose may still be broken down and energy transferred. Alcoholic fermentation is another way to respire anaerobically and involves converting glucose into alcohol. The formula for anaerobic respiration is: glucose + alcohol carbon dioxide + energy As with aerobic respiration, carbon dioxide gas is given off. Alcoholic fermentation is far less efficient at giving energy than aerobic respiration. ...read more.

Middle

Glucose, yeast, limewater, and a very thin layer of paraffin. Safety: * Goggles and lab coats must be worn at all times. * Substances must not be touched, tasted or smelt. * Hands must be washed once experiments have been completed. * Reactions must be observed carefully. Fair Test: * The seal between the bung and the test tube must be air tight. * Use a thin layer of paraffin each time. * Use the same amount of glucose solution and yeast each time. * Experiment could be performed more than once. Factors to control and vary: For each experiment, the factors to control are the amount of glucose, yeast and liquid paraffin. The factory to vary is the temperature in each experiment Preliminary experiment Method: The apparatus was set up as shown in the diagram below. ...read more.

Conclusion

6 5 6 8 7 10 12 13 45 20 6 5 5 4 5 30 20 6 5 7 7 8 10 11 12 13 13 50 30 11 13 16 12 16 18 14 40 30 37 73 13 23 24 23 22 40 40 35 18 19 21 20 20 28 40 40 4 16 22 19 24 18 16 14 15 50 Conclusion: In conclusion, it can be seen that the most effective temperature for anaerobic respiration to occur is 30 degrees centigrade as this is when the most carbon dioxide is produced. Prediction: Based on the preliminary experiment and background scientific information, I predict that initially, as temperature increases, the amount of respiration will increase also but it will reach a peak at a certain temperature and any temperature increase after that it will result in a decline of the amount of respiration. Ricky Winborn Biology Coursework ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Effect of Anaerobic Respiration On Yeast

    5 star(s)

    In the real experiment a greater range will be used. From 0�C through to 60�C. This should hopefully give a larger range and therefore a better set of results to analyse. MAIN EXPERIMENT: Variables: Factor Effect How it will be controlled Temperature Varied for individual parts of the experiment, but must remain constant when chosen.

  2. Marked by a teacher

    effect of temperature on the rate of respiration in yeast

    5 star(s)

    A greater chance of getting anomalous results as carbon dioxide can be lost. The indicator is actually a use of dehydrogenase enzyme and measuring the production of carbon dioxide using gas burette or a gas syringe is a use of decarboxylase enzyme.

  1. Marked by a teacher

    An investigation into the effect of different sugars on respiration in yeast.

    5 star(s)

    * Time respiration takes place (10 minutes) Temperature of water bath Volume of water at start (cm3) 1 2 3 4 5 6 7 8 9 10 Volume of CO2 produced (cm3) 30/32�C 50.0 50.0 50.0 50.0 48.5 46.0 43.0 39.3 35.7 32.2 28.5 21.5 40/42�C 50.0 50.0 50.0 50.0 48.6 46.8 44.6 42.4 40.2 38.0 35.8

  2. Marked by a teacher

    'An investigation into the ability of two strains of the yeast Saccharomyces cerevisiae to ...

    4 star(s)

    These sugars are mainly glucose and fructose, both simple saccharides. The Narbonne strain of wine yeast is best suited to the production of wine from grapes, rather than from other fruits, vegetables or grains such as elderberry or rice. Another important constituent of grape juice is the acid content, consisting mainly of tartaric and malic acids.

  1. An investigation into the effects of temperature on the rate of anaerobic respiration of ...

    50 24 31 41 28 22 31 33 42 40 51 Averages: Results for the bubble length at each 5 minute interval added together 10 students (number of results recorded) = Average For example; at 20 �C, the average5 minute result is: 22 10 =2.2 A table to show the average results of bubble length (mm 1d.p)

  2. Weed study. Dandelions - descrption and characteristics. Investigation to dandelion distribution.

    Interactions between plants affect their distribution and abundance. When a major resource, such as water or nitrogen, is in short supply, plants may compete with each other for use of the resource. Species that can use the resource more effectively are likely to grow faster and therefore to be more abundant.

  1. Bats investigation

    Once one's eyes adjust to the darkness, it's clear that a lot of care went into making the area around the entrance resemble a cave. Artificial rock has been set up in a way that arches over one's head, and much like in real caves, it is necessary (or it feels necessary)

  2. Investigating how prolonged exposure to its optimum temperature affects the respiration of yeast.

    The kinetic theory suggests that, when extra heat is added (like in the investigation) it causes particles to react more vividly, with additional energy. The activation energy (measured in kilojoules per mole) of a molecule is the minimum amount of energy with which particles need to collide to cause a reaction.

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