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Enzyme Activity

Figure from experiment 23 from Investigating Chemistry through Inquiry

Introduction

Enzymes are globular proteins, responsible for most of the chemical activities of living organisms. They act as catalysts, substances that speed up chemical reactions without being destroyed or altered during the process. Enzymes are extremely efficient and may be used over and over again. One enzyme may catalyze thousands of reactions every second.

H2O2 is toxic to most living organisms. Many organisms are capable of enzymatically destroying the H2O2 before it can do much damage. H2O2 can be converted to oxygen and water, as follows:

{\text{2 }}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{2 }}{{\text{H}}_{\text{2}}}{\text{O  +  }}{{\text{O}}_{\text{2}}}

Although this reaction occurs spontaneously, enzymes increase the rate considerably. Catalase, a common enzyme that is found in the cells of nearly all living organisms, catalyzes the decomposition of H2O2. A great deal can be learned about enzymes by studying the rates of enzyme-catalyzed reactions.

Objectives

In the Preliminary Activity, you will use catalase in yeast to catalytically decompose hydrogen peroxide. You will determine the rate of enzyme activity by measuring the pressure of oxygen gas produced as H2O2 is decomposed.

After completing the Preliminary Activity, you will first use reference sources to find out more about enzymes and enzyme activity before you choose and investigate a researchable question dealing with enzyme activity.

Sensors and Equipment

This investigation features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Investigating Chemistry through Inquiry »

Investigation 23 from Investigating Chemistry through Inquiry Lab Book

<em>Investigating Chemistry through Inquiry</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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