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If all living organisms require energy to live and food is broken down to provide that energy, then what by-products are created in the process? Breathe new life into your discussions of aerobic and anaerobic respiration (fermentation) with this quick and easy experiment. Students grow yeast cells in fermentation tubes and observe the formation of metabolic by-products. Glucose test strips are used to measure the concentration of glucose (the food source) as it is consumed and an indicator is added to detect changes in the oxygen concentration inside the tube. Graphing the data allows students to compare the rate of glucose consumption to the rate of carbon dioxide formation as the yeast culture grows. Use the included lab extensions to convert this experiment into a great inquiry-based activity for the entire class. Contains enough materials for 30 students working in groups of three.