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Cellular Respiration Lab

This lab investigates the products of cellular respiration and fermentation through a simple experiment using sugar and yeast. By dissolving sugar in warm water and combining it with yeast in an airtight bag, students will observe gas production over time. The experiment addresses questions related to gas formation, sugar concentration, energy use by yeast, and the overall purpose of cellular respiration. Students will analyze results and draw conclusions based on their observations regarding the changes in sugar levels and gas production.

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Cellular Respiration Lab

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  1. Cellular Respiration Lab Problem: What are the products of cellular respiration and fermentation? Background: Hypothesis:

  2. Procedure: • Disolve 1 heaping teaspoon of sugar in 75 ml of warm water. • Add 1 “tasterspoon” of yeast to a ziploc plastic bag. • Add the sugar solution to the bag and seal. • Mix the solution together. • Label the bag with your name. • Set bag in container and let set for an hour. • Observe results. • Return bag to container to set overnight days.

  3. Data Analysis: • What was the gas in the bag? • What would you expect to happen to the concentration of the sugar in the bag? Why? • What are the yeast cells using energy for? • If we can keep the bag sealed, and air-tight, so no oxygen gets in, what do you expect to happen? • What are the products of cellular respiration? • What is the purpose of cellular respiration?

  4. Period 7 • What was the gas in the bag? • What do the yeast use energy for? • What did the yeast smell like? • Why? • What do the yeast use sugar for? • Do you think there is more, less, or the same amount of sugar now in the bag?

  5. Conclusion:

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