• 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. effect of temperature on the rate of respiration in yeast

5 star(s)

The yeast's function in baking is to ferment sugars present in the flour or added to the dough. This fermentation gives off carbon dioxide and ethanol. The carbon dioxide is trapped within tiny bubbles and results in the dough expanding, or rising.

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

5 star(s)

* Using a graduated pipette, take 9cm3 of yeast and place in a boiling tube. Keep in the water bath. * Using a clean pipette, take 1cm3 of the sugar solution and place in the boiling tube with the yeast.

1. Fighter Pilot A Statistical Analysis of Reaction time and its Correlation with Dominant ...

5 star(s)

worrying light upon many occupations in society today that allow employees to work between 12 hours to 24 hours a day, for example, doctors or pilots. Increasing the quantity of alcohol consumed causes the reaction time to become highly impaired (9)

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

by the work of bile salts to allow lipase to act on them. Hypothesis From the research I have carried out I predict that as the concentration of bile salts is increased, so will the activity of lipase on the breakdown of milk and therefore so will the rate of reaction.

2. The Pancreas is a large gland that forms part of the Endocrine System, but ...

Water and other parts that make up the plasma go through as well. The actual filter is the basement membrane, which the capillary endothehelial cells rest on. When blood reaches the arterial end of the capillary it is under pressure because of the pumping action of the heart and the resistance to the blood flow (because the capillaries are narrow).

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

This theory can be proven using an experiment, because enzymes are involved in some of the biological pathways for respiration. Some of the main enzymes are dehydrogenase enzymes and decarboxylase enzymes, the dehydrogenase enzymes take hydrogen and pass them onto NAD molecules, or simply let them stay in the matrix, and wait to be bonded with an oxygen molecule.

2. Effects of exercise on tidal volume and breathing rate

One way to improve this method is too use a device called a spirometer. It can be used to measure expired and inspired volumes of air over a timed period. From the results it can be calculated how fast the lungs can be filled and empted as well as the volume of air moving in or out of the lungs.

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