IsYeastAliveProtocol - Is Yeast Alive Adapted from Is Yeast...

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Is Yeast Alive? Adapted from “Is Yeast Alive?” by Penny Bernstein at Kent State University, Stark Campus copyright 2008 by Dr. Ingrid Waldron and Jennifer Doherty, University of Pennsylvania Biology Department 1 Humans use yeast every day. What is yeast, and what are some common uses of yeast? You can buy yeast to make bread in the grocery store. This yeast consists of little brown grains. Do you think that these little brown grains of yeast are alive? Why or why not? To find out whether yeast is alive, we first need to think about what makes something alive. What are some characteristics of living organisms? To begin to answer the question, "Is yeast alive?”, you will test whether the grains of yeast have two characteristics of living things -- the ability to grow and the ability to use energy (referred to as metabolism). Scientific Experiment to Test for Metabolism We will carry out an indirect test for metabolism. In other words, we will be indirectly testing whether yeast can use energy, which is one of the characteristics of living organisms. When yeast, humans, and other living organisms use energy, they break down high- energy molecules like sugar to get the energy they need and give off a gas called carbon dioxide as a by-product of this reaction.
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IsYeastAliveProtocol - Is Yeast Alive Adapted from Is Yeast...

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