• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2

# Investigating effect of changing glucose concentration on respiration in yeast

Extracts from this document...

Introduction

Investigating the Effect of a Variable on the Rate of Respiration in Yeast Method 1. Make a yeast solution with the yeast concentration of 20% by mixing 4 parts water with 1 part powdered yeast. 2. 20cm3 of this is added to a conical flask 3. ...read more.

Middle

To work out the percentage of glucose solution, I divided the mass of glucose added by 30 as the yeast solution added was 20cm3 and the water 10cm3 hence a total volume of 30cm3. Conical Flask Yeast Solution added (cm3) Volume of water added (cm3) ...read more.

Conclusion

To work out rate of reaction I divided average CO2 by the time taken in seconds (120). Conical Flask Carbon Dioxide Produced (cm3) Rate of Reaction/ cm3 s-1 Repeat 1 Repeat 2 Repeat 3 Average Average CO2/Time (Secs) A 7 7 8 7.33 7.33/120= 0.06 B 17 18 17 17.33 17.33/120= 0.14 C 16 20 19 18.33 18.33/120= 0.15 D 21 20 21 20.67 20.67/120=0.17 ?? ?? ?? ?? ...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

## Here's what a star student thought of this essay

3 star(s)

### Response to the question

A good essay for explaining how this type of experiment may be carried out, but does not explain the overall scientific reasoning behind the experiment or explain the results with a conclusion. The student provides a basic response to the ...

### Response to the question

A good essay for explaining how this type of experiment may be carried out, but does not explain the overall scientific reasoning behind the experiment or explain the results with a conclusion. The student provides a basic response to the question and rather than explaining the purpose to the experiment, the science behind it and the prediction they just display a set of results and how they did the experiment, and whilst the overall results are correct and if you had an understanding of the respiration topic you would understand the results, I would like to see a bit more background and scientific explanation in this essay, as well as a prediction and conclusion. Explains how the experiment is done very well.

### Level of analysis

The analysis is appropriate for this level as it considers the main factors involved in respiration and uses them appropriately to investigate the question e.g. CO2 output. However, the results are not analysed so there is no knowledge as to if the student understands why they are doing the experiment or if they are just collecting data and following a set experiment. They do not explain why the variable was used and why it would affect yeast respiration.

### Quality of writing

The punctuation, spelling and grammar are all fine, and the reader communicates meanings clearly. Also uses the correct units throughout the experiment for the different substances. Could have been a bit more explicit with how to do each part of the experiment and the meaning behind it.

Reviewed by skatealexia 01/03/2012

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

# Related AS and A Level Energy, Respiration & the Environment essays

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

5 star(s)

Preliminary 1 - 30�C - no shaking This was to determine which ratio to use in the real experiment. Preliminary 1 - Method * Prepare the temperature of the water bath to 30-32�C and place the yeast and sugar in the water to ensure they are both at the same

2. ## Effect of Anaerobic Respiration On Yeast

5 star(s)

Finally at 60�C I predict that less carbon dioxide will be produced than 40�C or 50�C. However predict that respiration will still occur. Because not all the heat energy will be passed to the yeast, the temperature at 60�C will not be sufficient to completely denature the enzymes but will

1. ## effect of temperature on the rate of respiration in yeast

5 star(s)

permanently blocks the active site and doesn't allow any substrate to bind with active site. Denaturation of enzymes: When enzymes are placed into a high temperature they start to denature. Denaturation can be defined as the loss of enough structure to render the enzyme inactive.

2. ## What effect does substrate have on respiration in yeast?

Thermometer To measure the temperature of the water bath. Water bath To place the beaker holding the yeast solution. Then the conical flask with the yeast solution and substrate. Buffer solution To be placed with yeast suspension in order to keep the pH fairly constant. Tap water To fill the 100ml graduated cylinder and one of the 250ml beaker

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

The gradients are less steep at this point, for example, at 20 �C the gradient is 0.2mm/per min. This is due to the end products of respiration and lack of nutrients in the solution. Therefore yeast can not respire anymore.

2. ## Investigate the effect of bile salt concentration on the digestion of milk by the ...

However, when the reaction is catalysed by an enzyme, the rate of reaction often peaks at the optimum temperature and then dramatically falls. The reason for this is because even though the molecules have more energy, the enzyme is denatured.

1. ## the effect of bile concentration on the activity of the enzyme lipase during the ...

However when you increase the temperature beyond the optimum temperature enzyme molecule is disrupted because the atoms that make up the enzyme begin to vibrate distorting the active site of the enzyme making it much harder for the substrate to fit into it because of the specific shape that it

2. ## Effects of exercise on tidal volume and breathing rate

Conclusion As the humans move from a period of rest to exercise, there is an increase in the demand for oxygen. To meet this demand the rate of respiration and the amount of oxygen taken into the lungs is increased. Discussion When we breathe oxygen is brought into the lungs.

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