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

The Factors Effecting the Anaerobic Respiration of Yeast Cells

Extracts from this document...

Introduction

The Factors Effecting the Anaerobic Respiration of Yeast Cells Name: Joe Cox Set: 10A3 Form: 10H Control Variables; Ph - This is difficult to change and keep constant. That is why I did choose this variable to investigate. Concentration - This is reasonably simple to investigate. A lack of background knowledge of this subject prevented me from investigating this. Amount of Yeast - This is a reasonably simple variable to investigate but I don't think it would be in depth enough to write a good conclusion. All these variables must now be kept at a constant to make a fair test. Input Variable - Temperature This is the variable that I have chosen to investigate. It is simple enough but in depth enough to write a good conclusion. Background Information When yeast cells respire anaerobically the let off carbon dioxide off as a bi product of the respiration. This is less dense than water so it causes the beads to rise in water. This is the tester I use to see how the yeast cells are respiring. Prediction I predict that the warmer the solution then the faster the beads will rise. ...read more.

Middle

When filling up beakers and boiling tubes we must be extremely careful in order not to burn ourselves. The yeast cells can also be irritable if they get in eyes, so some care must be taken when using these cells. Diagram Results Temperature How long (1st) How many after ten minutes? Average Room (21�) 26.47 0 26.421/2 seconds 26.38 0 30� 10.45 0 10.321/2 seconds 10.20 0 40� 6.05 10 6.121/2 seconds 6.20 10 45� 4.30 10 5.01 9 50� 5.15 10 5.21 seconds 5.27 10 60� 30 + minutes 0 No average 30 + minutes 0 Analysis From my results you can see that the basic relationship is that as the temperature gets higher it takes less time for the beads to rise. The graph shows the relationship as a negative correlation. The graph is not a straight line; this is because the temperature does not increase at a proportional rate to the time taken for the yeast balls to rise. This is explained in the conclusion. The graph dips at 45� and then goes up again afterwards. For the basic results it does not prove or disprove my prediction. ...read more.

Conclusion

A problem with my prediction is that it stated that at forty degrees the cells would denature but the results and graph showed that the cells denatured at 45 degrees C. This is what the dip in the graph has shown. This could be for various reasons, the most likely reason is that the cells did not actually experience temperatures of those stated. The water in the water bath would lose heat before it reached the beads, this is due to temperature travelling through the glass and losing heat energy on the way. An alternative explanation for this is the beads were not subject to these temperatures because they were insulated by other beads surrounding them. The added test of the beads at 45�C was a very beneficial us. It enabled us to find out the optimum temperature that the beads respired at. It also enabled us to work out the temperature at which the beads denatured; this was a temperature around the 45�C area. We cannot say for sure due to the cooling baths losing heat energy and the insulating properties of the beads. Up to the forty five-degree point the yeast balls respired more efficiently at a higher temperature, this was due to the increased energy the particles were given. My prediction was proved mainly correct. ...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 Molecules & 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 AS and A Level Molecules & Cells essays

  1. Marked by a teacher

    The Effect Of Temperature on the Respiration Of Yeast.

    5 star(s)

    respiration will take place not long after the experiment has started and this will effect the rate of reaction. I will control this by bubbling air into the yeast suspension). * The time left for the yeast to be oxygenated (This has to be controlled because if the yeast is

  2. Marked by a teacher

    Investigating respiration of maggots

    5 star(s)

    Theory Respiration is a process in which organic molecules are broken down in several stages to release chemical potential energy. This is then used to synthesise adenosine triphosphate (ATP). Usually the organic molecule is glucose, but fatty acids and amino acids can also be used if glucose is not present.

  1. The factors that affect the respiration of immobilised yeast

    For fermentation of occur, yeast requires a source of carbohydrates, anaerobic conditions and a suitable temperature. Fermentation stops when the yeast becomes poisoned by its own waste, the alcohol, which acts as a non competitive inhibitor to the enzymes involved in the process.

  2. An experiment to find of the isotonic point of root vegetables cells in contents ...

    incorrect mass and to reduce the chance of this error happening again it is crucial that I am not distracted and make sure I check the mass twice before recording it. Due to this I may have gained anomalous results for the masses obtained.

  1. Affect of sucrose concentration on the rate of respiration.

    If the pH changes much from the optimum, the chemical nature of the amino acids can change. This may result in a change in the bonds and so the tertiary structure may break down. The active site will be disrupted and the enzyme will be denatured.

  2. Investigating the Effect of Temperature on Rate of Respiration in Yeast

    Temperature Enzymes work up to their optimum temperature proportionally to the rate of reaction. Increase in temperature increases the kinetic energy of the particles which causes them to move faster and faster. If they begin to go too fast, atoms begin to vibrate too vigorously and the chemical begins to break down.

  1. Investigation to discover the effect of temperature on anaerobic respiration in yeast cells.

    Yeast can respire using oxygen, this is known as aerobic respiration and releases up to 20 times more energy that fermentation or anaerobic respiration. However the investigation that I wish to proceed with does not require aerobic respiration, therefore I will coat the surface of the yeast solution with a

  2. Daphnia write up

    in the heart rate, possibly due to the paralysis affect on the Daphnia. Nevertheless, the fact that the increased caffeine concentration did cause an increase in heart rate did agree with my hypothesis. This suggests, as expressed earlier, caffeine does have a stimulatory effect on the heart rate of living organisms.

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