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ZingPath: Cellular Energy: Respiration

Comparing Lactic Acid Fermentation and Ethyl Alcohol Fermentation

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Lesson Focus

Comparing Lactic Acid Fermentation and Ethyl Alcohol Fermentation

Biology

Learning Made Easy

You get to reveal the ways in which cells use the energy stored in sugar to produce the ATP that powers their chemical reactions. View each of the major pathways involved in ATP production, and then see how this compares to photosynthesis.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain lactic acid fermentation.
  • Explain ethyl alcohol fermentation.
  • Give examples of the industrial uses of lactic acid fermentation and ethyl alcohol fermentation.
  • List the similarities between lactic acid fermentation and ethyl alcohol fermentation.
  • Compare the products of lactic acid fermentation and ethyl alcohol fermentation.

Everything You'll Have Covered

What are the similarities between ethyl alcohol fermentation and lactic acid fermentation?

~ In both types of fermentation, no oxygen is needed. Glucose molecules are broken down into smaller pyruvate molecules and heat is released. Four ATPs are produced resulting in a net gain of 2 ATPs.

What are the differences between ethyl alcohol fermentation and lactic acid fermentation?

~ During ethyl alcohol fermentation, the pyruvate molecules are broken down into ethyl alcohol molecules and carbon dioxide molecules. During lactic acid fermentation, the pyruvate molecules are broken down into lactic acid molecules only.

Why is ethyl alcohol fermentation used to produce foods like bread, beer, wine, and vinegar?

~ During ethyl alcohol fermentation both ethyl alcohol and carbon dioxide are produced. The carbon dioxide is needed to make baked goods so they will "puff up," and ethyl alcohol is needed in the production of alcoholic beverages like beer and wine.

Why is lactic acid fermentation used to produce foods like yogurt and cheese?

~ During lactic acid fermentation, only lactic acid is produced. Products like yogurt and cheese need lactic acid to be produced.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be able to define the following terms: ATP, ATP production, and beer.
Course Biology
Type of Tutorial Animation
Key Vocabulary ATP, ATP production, beer