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Investigating Bacteria Growth http://www.classzone.com/books/hs/ca/sc/bio_07/virtual_labs/virtualLabs.html Predictions on bacterial growth in Aerobic and Anaerobic conditions: 1. Explain whether or not you think bacteria need oxygen in order to grow? ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ Record you observations for each bacteria type in aerobic (with oxygen) and anaerobic (without oxygen) conditions. Bacteria Species Observations Amount of Growth in Medium A (environment with oxygen) Location of growth in medium B (environment without oxygen) B. Strearothemouphilius Vial 1 C. Sporogenes Vial 2 E. Coli Vial 3 Oxygen Needs Based on the observations you recorded, complete the table below. Enter one of the following “bacteria need oxygen”, “bacteria don’t need oxygen, or bacteria can grow with our without oxygen” for each species of bacteria listed below. Bacteria Species B. Strearothemouphilius Vial 1 C. Sporogenes Vial 2 E. Coli Vial 3 Oxygen Needs Analyze and Conclude 1. Conclude. Based on your observations, is it possible that bacteria can thrive in a sealed can and cause vegetables to spoil? _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 2. Compare and Contrast. How did the presence of oxygen affect bacterial growth? _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 3. Evaluate. What factors in addition to oxygen might influence the growth of different types of bacteria. _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 4. Infer. Scientists hypothesize that bacteria might have been among the first living organisms or earth. If this is true, which type of bacteria do you think was the first to develop on Earth: bacteria that need oxygen or bacteria that does not need oxygen? Explain your answer. _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ 5. Infer. What might the results of this lab mean in terms of the ability for microbes to live and thrive on other planets or moons that don’t have oxygen in their atmosphere? _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________ _____________________________________________________________________