1a BIOL 2230 Microbiology: Bacterial Growth Homework Part 2-5 points 1., Classif

Question

1a BIOL 2230 Microbiology: Bacterial Growth Homework Part 2-5 points 1., Classify the bacterial growth in each tube (to theR side) based on oxygen concentration. (black dots indicate bacterial growth) a. b. C. d. e. tConsidering the four stages of the bacterial growth curve...A. Under what conditions would lag phase not occur? B. Why do cells enter stationary phase? Classify the organism in each description based on its temperature requirements a. A bacterium that thrives in an Alaskan glacier b. An archaea isolated from the hot springs in Yellowstone National park. c. A bacteria that thrives at body temperature but can grow slowly when refrigerated d. A bacteria that thrives at body temperature but dies under refrigeration or bolling conditions What is meant by the word sterile? What is aseptic technique and is it necessary for successful maintenance of pure cultures in the laboratory?

Explanation / Answer

1. Based on the oxygen concentrations, bacteria in tube

a Obligate aerobes: Oxygen is necessary for their growth.

b Obligate anaerobes: Do not require oxygen

c Facultative anaerobes: can grow with or without oxygen

d Microaerophiles: Require oxygen at low concentrations

e Aerotolerant organisms: Not affected by the oxygen concentration

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