Having learned the optimum sugar concentration, for yeast to produce alcohol. A group of students next decide to investigate if different strains of yeast produce different amounts of alcohol. Fill in your answers on each line below: What is the independent variable?
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The students having learned the optimum sugar concentration is 20%; students next decide to investigate whether different strains of yeast ferment glucose to produce different amounts of alcohol. Briefly explain how this experiment would be set up? Identify the Independent Variable, the Dependent Variable and the control.
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SCENARIO 1: A group of students hypothesize that the amount of blood alcohol produced in fermentation depends on the amount of glucose supplied to the yeast. They want to use 5%, 10%, 15%, 20%, and 30% glucose solutions. a) What is the independent variable? b) What is the dependent variable? c) What negative control should be used? d) List two (or more) conditions that should be held constant.
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Questions for Review 1. A group of students hypothesizes that the amount of alcohol produced in fermentation depends on the amount of glucose supplied to the yeast. They want to use 5%, 10%, 15%, 20%, 25%, and 30% glucose solutions. a. What is the independent variable? b. What is the dependent variable? c. What control treatment should be used? d. What variables should be standardized? 2. Having learned the optimum sugar concentration, the students next decide to investigate whether different strains of yeast ferment glucose to produce different amounts of alcohol. Briefly explain how this experiment would be set up. 3. A group of students wants to study the effect of temperature on bacterial growth. To get the bacteria, they leave petri dishes of nutrient agar open on a shelf. They then put the dishes in different places: an incubator (37°C), a lab room (21°C), a refrigerator (10°C), and a freezer (0°C). Bacterial growth is measured by estimating the percentage of each dish covered by bacteria at the end of a 3-day growth period. a. What is the independent variable?
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