Structure and Characteristics of Microorganisms – The graduate recognizes types and characteristics of microorganisms, performs biochemical tests, and recognizes principles of osmosis.

Recognize the basic principles of osmosis.

Test for the effects specified osmotic changes have on a given microbe in a laboratory setting.

Task:

Upon completion of the lab, write a brief essay (suggested length of 1-2 pages) in which you:

A. Define the following three terms in relation to microbial growth:
• Isotonic
• Hypotonic
• Hypertonic

B. Describe your observations for Staphylococcus epidermidis and Saccharomyces cerevisiae under these conditions:
1. 1% NaCl solution
2. 7% NaCl solution
3. 15% NaCl solution

C. Explain the results of your observations for Staphylococcus epidermidis and Saccharomyces cerevisiae in NaCl solutions.