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Cellular Respiration in Yeast Lab

This lab explores the concepts of Cellular Respiration and Fermentation in yeast. Yeast do Alcoholic Fermentation and one of the byproducts is Carbon Dioxide. When you bake bread with yeast, Carbon dioxide is produced, which forms bubbles in the dough, causing the dough to rise. The heat kills the yeast and the bubble pockets lighten the bread.

In this lab, you can actually see fermentation happening by measuring “bubble production”. The tricky part of this lab is setting it up. So I put together a little video to show you exactly how to do that. Special thanks to my Student Worker Brian Powers for helping me film the video. He did a pretty good job – Smooth zooming and all. Enjoy!

Video Introduction

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Lab Handout

And here’s the actual lab. You can download it by clicking on the download link on the top left of the document. You will need Adobe Acrobat or another pdf viewer in order to download it and see it on your computer.

Sample Results

The following picture was taken approximately 45 minutes after the test tubes were placed in an incubator at 30 degrees Celcius. You can see that there’s CO2 production in both samples with sugar and none in the control (click image to enlarge).


CO2 Production (after 45 minutes)

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Leslie Samuel is the creator of Interactive Biology. His mission is to use this site to Make Biology fun for people all over the world.

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5 Responses to “Cellular Respiration in Yeast Lab”

  1. atiyah batool January 23, 2012 at 7:49 am #

    i like your way of presentation

  2. atiyah batool January 23, 2012 at 7:51 am #

    i like it but u should present it with examples

  3. hem February 17, 2013 at 8:51 pm #

    I liked your method of teaching