Name:
Class Period:
Date:
TAKE-OUT LABS : Yeast Respiration
1.
2.
3.
4.
5.
Why do living organisms carry out the process of respiration?
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Why is measuring the amount of carbon dioxide an appropriate way to determine the amount of
respiration in yeast?
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What substance does yeast use in respiration? ___________________________________________
What waste product of yeast respiration is useful in making wine? ___________________________
What waste product of yeast respiration is useful in making bread? __________________________
Part 1: How does Temperature Affect the Rate of Yeast Respiration?
Research Question: Yeast usually grows in warm temperatures. How does changing the environment to
a cold environment affect the rate of yeast respiration?
Your Hypothesis:
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Data Table
Time
Total Volume of Carbon Dioxide Produced (mL)
(minutes)
In Cold Water Environment
In Warm Water Environment
2
5
10
15
9. What is the research question for this experiment?
10. Independent Variable = _______________________________
11. Dependent Variable = ________________________________
12. Which setup is the control group? __________________________________
Which setup is the experimental group? _____________________________
13. List 3 controlled variables – factors that were kept constant in both of the setups for this experiment.
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14. What data are you collecting in this experiment?
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TAKE-OUT : Yeast Respiration Lab – Student Answer Sheet
Name:
Class Period:
Date:
TAKE-OUT LABS : Yeast Respiration
15. What results would you expect if your experiment supported your hypothesis?
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18. State ONE conclusion you can draw from this experiment.
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19. Does the experiment support your hypothesis? Why or why not?
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20. Predict what will happen to the amount of carbon dioxide produced if you let the experiment run for
an additional hour? Explain your answer.
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TAKE-OUT : Yeast Respiration Lab – Student Answer Sheet
Name:
Class Period:
Date:
TAKE-OUT LABS : Yeast Respiration
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21. Describe two specific things that you could have done to improve the reliability of this experiment.
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Part 2: Design Your Own Experiment
1. What is your hypothesis for this experiment?
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2. What is the independent variable? _____________________________________________________
3. What is the dependent variable? _______________________________________________________
4. What is the control group for your experiment?
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5. What is the experimental group for your experiment?
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6. List 3 controlled factors that you kept the same in both the experimental and the control groups.
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7. Write a procedure to describe how you will set up your experiment. Hint: Refer to the procedure
from Part 1 of this lab, and modify the procedure so that is appropriate for your research question.
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9. Explain how you modified the recipe.
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10. Explain how you will collect data during your experiment.
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11. Construct a data table and record the results for your experiment.
TAKE-OUT : Yeast Respiration Lab – Student Answer Sheet
Name:
Class Period:
Date:
TAKE-OUT LABS : Yeast Respiration
15. What conclusions can you draw based on the results of your experiment?
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16. Did your experiment support your hypothesis? Explain why or why not.
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17. Describe 2 specific things that you could have done to improve the reliability of your experiment.
_____________________________________________________________________________________
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TAKE-OUT : Yeast Respiration Lab – Student Answer Sheet
Name:
Class Period:
Date:
TAKE-OUT LABS : Yeast Respiration
Discussion:
1. Did the amount of CO2 change during the period of this experiment? If so, how did it
change?
2. Indicate the specific source of energy (ie, type of sweetener) used for respiration, if any, for
each experimental condition.
3. Which energy source was the most effective?
4. What process was occurring during the initial 15 minutes?
5. What process would occur after 1-2 days?
6. The yeast began its respiration aerobically, but then after time completed anaerobically as a
fermentation process. How do these two processes differ in terms of the produce and
energy yielded in this process? Fill out the chart to show this relationship.
Cellular Respiration
Fermentation
# of ATP’s formed?
Aerobic/Anaerobic?
Products?
7. Write the equation for cellular respiration.
8. List 2 forms of fermentation and where they occur.
TAKE-OUT : Yeast Respiration Lab – Student Answer Sheet