Is Yeast Alive? n - Penn Arts & Sciences

Is Yeast Alive? n

Adapted from "Is Yeast Alive?" by Penny Bernstein at Kent State University, Stark Campus copyright 2006 by Dr. Ingrid Waldron and Jennifer Doherty, University of Pennsylvania Biology Department

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Introduction

Humans use yeast every day. What is yeast, and what are some common uses of

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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

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To find out whether yeast is alive, we first need to think about what makes something

alive. What are some characteristics of living organisms?

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To begin to answer the question, "Is yeast alive?,' you will test whether the grains of yeast have one characteristic of living things - the ability to use energy (referred to as metabolism).

Scientific Experiment to Test for Metabolism

. ' "i t*.J.^r% i^i ,jM? 5^^/*'- ^" ^'viiK Do you expect yeast to produce a gas when no sugar or other food is available?

Explain the reasons for your predictions.

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