• 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 amount of gas produced by a solution of glucose and yeast.

Extracts from this document...

Introduction

Biology Coursework: An investigation into the amount of gas produced by a solution of glucose and yeast. Results % Glucose Concentration vol gas (mm3) 0 1 2 4 6 10 0 0 0 0 0 0 0 30 15 10 18 8 15 60 10 13 27 6 10 90 5 12 13 14 10 120 5 15 17 11 12 150 7 20 19 11 16 180 4 18 18 17 15 210 5 22 18 16 18 240 2 15 20 15 16 270 3 15 17 15 12 300 1 15 18 17 5 330 5 5 17 18 5 360 2 5 13 13 5 390 1 5 15 15 9 420 2 3 15 17 2 450 3 5 17 12 9 480 2 2 15 13 12 510 1 3 6 18 12 540 2 3 9 12 9 570 2 4 5 12 9 600 0 1 12 11 8 630 2 4 0 10 6 660 2 2 0 12 9 690 2 3 9 10 13 720 0 2 5 5 11 750 2 3 4 7 6 780 2 1 1 12 3 810 2 3 0 6 9 840 2 1 0 10 6 870 2 3 0 0 4 900 2 2 0 7 ...read more.

Middle

Alcohol would also be produced, but the reaction for anaerobic respiration, C6H12O6 --> 2C2H5OH + 2CO2 tells me that for every mole of glucose, two moles of alcohol would be produced, and thus a 1% solution of glucose would produce a 2% solution of alcohol when fermentation is complete, but this is only if the solutions are measured by moles, and in this case, I don't think it is safe to assume that this is so. Therefore, I cannot include this quantitative theory in my explanation. However, I could possibly work out if alcohol was ever a limiting factor by looking at the results; the four percent solution slowed down and basically stopped producing gas towards the end of the experiment. The fact that it stopped producing gas before it had produced double the amount of gas that the two percent solution produced shows that there must have been some limiting factor other than the yeast using up all the glucose. It could not have been that the cells had become plasmolised, because this would have had a much greater effect at the beginning of the experiment when the glucose concentration was higher. Therefore, I suggest that the factor that limited the four percent solution from producing more gas was that the alcohol levels had reached a level high enough to denature the enzymes and kill the yeast cell. ...read more.

Conclusion

Modifications If I were to conduct the experiment again, I would conduct all the experiments myself so that I could make sure that the conditions were exactly the same for every solution, and I would know exactly if something had been a bit odd in a certain experiment. I may also test the alcohol concentration after the experiment has finished so that I could see if that had been the limiting factor. I would also continue the experiment for longer so that I could see which solution ended up producing the most gas. With these bits of information, I would be able to work out the effect of alcohol on the solution, and decide if that had been a limiting factor. If I knew how much longer the solutions had continued to produce gas, then I would be able to test my theory that the six and ten percent solutions would continue to produce gas when all the others had finished. If they had done, then I would know that the limiting factor for those solutions had been the fact that the cells were plasmolised, however, if they had stopped producing gas just after the four percent solution had, then I would know that alcohol had been the limiting factor. Hector Guinness 03/05/2007 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 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

    Investigating respiration of maggots

    5 star(s)

    This is why in my investigation the manometer fluid in the manometer will move towards the maggots. The maggots require oxygen for this last stage of respiration, which is what I am measuring to calculate the rate of respiration. However this only accounts for 3 of the 28 molecules of ATP formed during oxidative phosphorylation.

  2. Investigation to find the effect of glucose concentration on fermentation of yeast.

    8 Syringes To measure the amount of substrate that I will use. Clam and Stand The test tubes can stand in the water bath. Variables In this experiment I will need to monitor these variables, * Temperature * Volume of glucose concentration * Volume of yeast * Volume of phenolphthalein.

  1. The investigation to find the effect of glucose concentration on fermentation of yeast.

    The yeast contains enzymes which could change the rate of reaction depend on the amount of substrate. The amount of glucose will also change the rate of reaction depending on the other substrate that I will be using. The amount of phenolphthalein will also change the rate of reaction.

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

    Bibliography The following textbooks were used, for reading background information on the major topics relevant to my investigation. * Understanding Biology -Glenn and Susan Toole. * Advanced Biology -Ann Fullick. * Biology Principles and processes - Michael Roberts and Michael Reiss, * Biology 1, (Chapter 3)

  1. The aim of this investigation is to find out how concentration of glucose affects ...

    I will then make the glucose solution. This will be done by adding 18g of powdered glucose to a litre of water. This will be my 100% solution. This will then be placed into the water bath to allow its temperature to reach the correct value.

  2. Investigating the Effect of Glucose Concentration On the Rate of Reproduction of Yeast Cells

    is transported into the yeast cell, it is necessary to study glucose and the barrier that it has to cross, the outer cell membrane, as well as the implications of this. Glucose The structure of glucose is shown on the right.

  1. Catalyse Investigation

    Amylase The Effect Or Varying Enzyme Concentration On The Breakdown Of Hydrogen Peroxide In The Presence of [Save this essay for later viewing] [View Saved Essays] Hypothesis - Hydrogen peroxide will breakdown to oxygen and water in the presence of Catalase.

  2. Amylase Investigation

    Therefore starch plus water becomes maltose (which is equivalent to two joined glucose molecules). There are two kinds of amylase enzymes. Alpha-amylase is found in saliva and is called ptyalin. This can carry on working in the stomach for several hours (and can digest up to 40% of starch under correct conditions of stomach acidity and food solidity).

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