Name ______

Objectives:Identify the pathogen that causes Yogurtness.

Use the scientific method

Analyze the metabolic process that bacteria use to obtain energy.

Use the Scientific Method to:

a)Prove that a specific species of organism is responsible for the development of yogurtness.

b)Prove that a specific organism is responsible for the development of yogurtness, not some other factor.

c)The design of your experiment must utilize Koch’s postulates.

Student Investigation

Objective:

Hypothesis:

Protocol (Experimental Design):

Data:

Questions:

  1. What are the symptoms of healthy milk? Yogurtness milk? (Include all symptoms that could be observed and tested for in this investigation).
  2. How do you know that a specific species of microorganism causes Yogurtness? (use data from your investigation for support)
  3. How do you know that a microorganism causes Yogurtness and that the disease is not caused by some other factor? (use data from your investigation for support)
  4. If you looked at the initial plates that were streaked with yogurt and saw more than one species of bacteria growing on the plates, what conclusions could you draw?
  5. Which of Koch’s postulates are tested by adding the bacteria from the initial plates to the milk?
  6. Based on your results can more than one species of bacteria cause Yogurtness?_____ Based on research, can more that one species cause Yogurtness? Explain with examples:
  7. Which metabolic process is used by the bacteria to metabolize milk? What is the significance of the byproducts of this process in regards to testing for the symptoms of Yogurtness?
  8. Why were the development of Koch’s postulates important in the understanding of the cause of disease?

1 Students will demonstrate the ability to use the scientific method to solve problems. / / 20
5. Students will be able to communicate their ideas and new scientific knowledge using written, oral or electronic media. / / 7
7. Students will demonstrate an understanding of how the organization of organisms accommodates the need for obtaining, transforming, transporting, releasing and eliminating energy. / / 3
Overall / / 30