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Main Curriculum Tie:
Background For Teachers:
From the carbon cycle model you have created with your students, there are multiple lines/arrows pointing back to the atmosphere labeled “cellular respiration.” This lab will investigate the process of respiration further. There are two types of cellular respiration: aerobic (requiring oxygen) and anaerobic (lacking oxygen).
Yeasts are heterotrophic organisms, meaning they need to acquire their food for energy. Classified as a type of fungus, yeasts obtain energy from sugar (glucose) in an aqueous environment by a specific anaerobic process called fermentation. There are two types of fermentation: lactic acid fermentation (which occurs in our muscle cells when they are oxygen deprived) and alcoholic fermentation (which is involved in food production, such as bread, cheese, beer and wine). Alcoholic fermentation begins once glucose diffuses into the yeast cell. The glucose is broken down into two 3-carbon molecules called pyruvic acid. The pyruvic acid is then broken down into carbon dioxide, ethanol and energy for the yeast cell. The carbon dioxide is released in a gaseous state and can be seen bubbling in a bottle or as the gas fills a balloon (which is why bread rises).
Student Prior Knowledge:
Intended Learning Outcomes:
3. Demonstrate Understanding of Science Concepts, Principles and Systems
4. Communicate Effectively Using Science Language and Reasoning
5. Demonstrate Awareness of Social and Historical Aspects of Science
Created Date :