QuestionAugust 16, 2025

11. Design an experiment to test the effects of anaerobic conditions on the activity of yeast cells. Use the six plastic bags you washed and dried in Part 1, as well as any other leftover materials you have. In the space below, write a hypothesis for your experiment, predictions for your results, and the steps of the procedure you have designed. (14 points)

11. Design an experiment to test the effects of anaerobic conditions on the activity of yeast cells. Use the six plastic bags you washed and dried in Part 1, as well as any other leftover materials you have. In the space below, write a hypothesis for your experiment, predictions for your results, and the steps of the procedure you have designed. (14 points)
11. Design an experiment to test the effects of anaerobic conditions on the activity
of yeast cells. Use the six plastic bags you washed and dried in Part 1, as well as any
other leftover materials you have. In the space below, write a hypothesis for your
experiment, predictions for your results, and the steps of the procedure you have
designed. (14 points)

Solution
4.6(223 votes)

Answer

The experiment is designed to compare CO_2 production by yeast under anaerobic vs. aerobic conditions using sealed and unsealed plastic bags. Explanation 1. Formulate Hypothesis Hypothesis: Anaerobic conditions will increase the fermentation activity of yeast cells, resulting in higher carbon dioxide production compared to aerobic conditions. 2. Make Predictions Prediction: Yeast in anaerobic conditions will produce more CO_2, causing greater inflation of plastic bags than those in aerobic conditions. 3. Gather Materials Use six plastic bags, yeast, sugar, warm water, and a method to seal the bags (e.g., rubber bands). 4. Prepare Yeast Mixture Mix equal amounts of yeast and sugar in warm water. Divide equally into six portions. 5. Set Up Experiment Place each portion in a separate bag. Seal three bags tightly for anaerobic conditions. Leave three bags slightly open for aerobic conditions. 6. Incubate Bags Keep all bags at a constant warm temperature for a set period (e.g., 24 hours). 7. Measure Results Observe and measure the inflation of each bag as an indicator of CO_2 production. 8. Analyze Data Compare the inflation levels between anaerobic and aerobic conditions to test the hypothesis.

Explanation

1. Formulate Hypothesis<br /> Hypothesis: Anaerobic conditions will increase the fermentation activity of yeast cells, resulting in higher carbon dioxide production compared to aerobic conditions.<br /><br />2. Make Predictions<br /> Prediction: Yeast in anaerobic conditions will produce more CO$_2$, causing greater inflation of plastic bags than those in aerobic conditions.<br /><br />3. Gather Materials<br /> Use six plastic bags, yeast, sugar, warm water, and a method to seal the bags (e.g., rubber bands).<br /><br />4. Prepare Yeast Mixture<br /> Mix equal amounts of yeast and sugar in warm water. Divide equally into six portions.<br /><br />5. Set Up Experiment<br /> Place each portion in a separate bag. Seal three bags tightly for anaerobic conditions. Leave three bags slightly open for aerobic conditions.<br /><br />6. Incubate Bags<br /> Keep all bags at a constant warm temperature for a set period (e.g., 24 hours).<br /><br />7. Measure Results<br /> Observe and measure the inflation of each bag as an indicator of CO$_2$ production.<br /><br />8. Analyze Data<br /> Compare the inflation levels between anaerobic and aerobic conditions to test the hypothesis.
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