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

An experiment to find out the effect of different sucrose solutions on the growth of yeast.

Extracts from this document...

Introduction

An experiment to find out the effect of different sucrose solutions on the growth of yeast. In this experiment I will be trying to find out how different amounts of sucrose solutions will effect the growth of yeast. Variables i) Temperature - If the Temperature were to increase it would have a great impact on the experiment, as it will be left for a few days (see later on in procedures). The temperatures inside the chronicle flask will all have to be at a fairly constant level, to allow the yeast cells growth effectively and at a steady rate, as this will be a fair test. ...read more.

Middle

To find out whether yeast grows better in a high or low concentration of yeast I will require six test tubes. Each test tube will be filled with a different concentration of the 10% sucrose solution; the volume of the solution in each of the test tubes will be 200ml Each tube will be filled with a different concentration (as shown in Fig 1). Fig 1 Fig 2 - A table showing the content of each of the test tubes Tube 1 Tube 2 Tube 3 Tube 4 Tube 5 How much of the solution is sucrose 4/4 3/4 1/2 1/4 1/8 Amount of sucrose (ml) 200 150 100 50 25 Amount of water (ml) ...read more.

Conclusion

When counting the yeast cells make sure that the cells that are on the line are not counted more that once. To avoid this you could: if they are touching lines only count the ones on the middle of the two sides, if they touch any other two lines ignore them. This experiment will last for two days and every three hours take samples from each of the chronicle flasks, place on the haemocytometer and record the number of yeast cells there are. It will be impractical to measure it over night so there will be a difference in my results during this time, as I will be measuring the experiment from 4o'clock on the previous day till 9o'clock the next day. ...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 Exchange, Transport & Reproduction 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 Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Biology coursework planning - the effect of lead chloride on the growth of cress ...

    5 star(s)

    This may have resulted in some intraspecific competition between the seeds for resources. Consequently, I will be using grid 1 as the method for distributing seeds which is to place one seed at each corner of the squares forming the grid.

  2. Peer reviewed

    "An investigation into the Respiration of Carbohydrate Substrates by Yeast."

    5 star(s)

    It works out that if the difference between the variance of the sum of the two means (of the two samples) is greater than twice the standard deviation of the difference between the means (of the two samples) then this is unlikely to have of occurred by chance, and therefore our data is significant.

  1. The effect of different sucrose concentrations on the growth of yeast.

    This pattern is seen with bacteria. 3 4 1) Lag phase 2) Log phase 2 3) stationary phase 4) Death/decline phase 1 During the lag phase, the yeast or bacteria has been added to the nutrient. They take a while to start reproducing, as adjustments to the new conditions are needed.

  2. Investigation into the effects of different

    the solution a more negative water potential value , which will result in the osmotic movement of water to move out of the yeast cells and into the solution .This , could result in the shrivelling of the cells, making it difficult for them to be seen and counted under

  1. To find out the factors affecting the refractive index of liquid by using different ...

    than for red light (longer wavelength). 4,5 Hypothesis Firstly I predicted that the relationship between concentration of salt and sugar solutions and refractive index should be linear. Secondly since the size of a sugar molecule is larger than a sodium chloride molecule. I predict that within the same concentration, the refractive index of sugar solutions will be higher than the refractive index of salt solutions.

  2. Design an experiment to investigate the effect of temperature on the movement of a ...

    It can be cleansed gently with chlorhexidine solution. Do NOT apply ice or cool to near-freezing temperatures (this can cause additional tissue injury). Minor thermal burns can be treated with local skin care such as aloe vera. Results A table to show how temperature affects the movement of beetroot pigment

  1. beetroot experiment

    form holes that will destroy the delicate structure so any pigments in the innermost compartment will spill out and that is why colour leak out of cooked beetroot as proteins denaturing at high temperature. Aim: To use beetroot to examine the effect of temperature on cell membranes and relate the effects observed to membrane structure.

  2. This experiment aims to investigate the effects of 4 different types of fish food ...

    The results from this investigation may not directly remediate this, but the production of completely artificial food could allow us to raise salmon independent of the ocean environment, eliminating these problems. Water pollution is also an issue, with the dense salmon population putting more pressure on the local biological environment, the formation of anoxic sediments under aquatic farms for example.

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