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Taxonomy of Aeromonas and C27 strains. An inoculated thioglycolate medium culture tube shows dense growth at the surface and turbidity throughout the rest of the tube. What is your conclusion? The organisms are facultative anaerobes. An inoculated thioglycolate medium culture tube is clear throughout the tube except for dense growth at the bottom of the tube.
The organisms are obligate anaerobes. Pseudomonas aeruginosa is a common pathogen that infects the airways of patients with cystic fibrosis. It does not grow in the absence of oxygen. The bacterium is probably which of the following? The bacterium is probably an obligate aerobe. Streptococcus mutans is a major cause of cavities.
It resides in the gum pockets, does not have catalase activity, and can be grown outside of an anaerobic chamber. The bacterium is probably an aerotolerant anaerobe. Why do the instructions for the growth of Neisseria gonorrheae recommend a CO 2 -enriched atmosphere? It is a capnophile. Four tubes are illustrated with cultures grown in a medium that slows oxygen diffusion. Match the culture tube with the correct type of bacteria from the following list: facultative anaerobe, obligate anaerobe, microaerophile, aerotolerant anaerobe, obligate aerobe.
Tube b is an obligate aerobe. Tube c is a microaerophile. Skip to content Microbial Growth. Learning Objectives Interpret visual data demonstrating minimum, optimum, and maximum oxygen or carbon dioxide requirements for growth Identify and describe different categories of microbes with requirements for growth with or without oxygen: obligate aerobe, obligate anaerobe, facultative anaerobe, aerotolerant anaerobe, microaerophile, and capnophile Give examples of microorganisms for each category of growth requirements.
Think about It Would you expect the oldest bacterial lineages to be aerobic or anaerobic? Which bacteria grow at the top of a thioglycolate tube, and which grow at the bottom of the tube? An Unwelcome Anaerobe Figure 4. This clinical photo depicts ulcers on the foot of a diabetic patient. Dead tissue accumulating in ulcers can provide an ideal growth environment for the anaerobe C.
Think about It What substance is added to a sample to detect catalase? What is the function of the candle in a candle jar? Figure 6. Key Concepts and Summary Aerobic and anaerobic environments can be found in diverse niches throughout nature, including different sites within and on the human body. Microorganisms vary in their requirements for molecular oxygen.
Obligate aerobes depend on aerobic respiration and use oxygen as a terminal electron acceptor. They cannot grow without oxygen. Obligate anaerobes cannot grow in the presence of oxygen.
They depend on fermentation and anaerobic respiration using a final electron acceptor other than oxygen. Facultative anaerobes show better growth in the presence of oxygen but will also grow without it. Although aerotolerant anaerobes do not perform aerobic respiration, they can grow in the presence of oxygen. Most aerotolerant anaerobes test negative for the enzyme catalase.
Optimum oxygen concentration for an organism is the oxygen level that promotes the fastest growth rate. The minimum permissive oxygen concentration and the maximum permissive oxygen concentration are, respectively, the lowest and the highest oxygen levels that the organism will tolerate.
Peroxidase , superoxide dismutase , and catalase are the main enzymes involved in the detoxification of the reactive oxygen species. Superoxide dismutase is usually present in a cell that can tolerate oxygen.
All three enzymes are usually detectable in cells that perform aerobic respiration and produce more ROS. A capnophile is an organism that requires a higher than atmospheric concentration of CO 2 to grow. Multiple Choice An inoculated thioglycolate medium culture tube shows dense growth at the surface and turbidity throughout the rest of the tube.
The organisms die in the presence of oxygen The organisms are facultative anaerobes. The organisms should be grown in an anaerobic chamber. The organisms are obligate aerobes. The organisms are aerotolerant. It uses CO 2 as a final electron acceptor in respiration. It is an obligate anaerobe. It fixes CO 2 through photosynthesis.
Matching Four tubes are illustrated with cultures grown in a medium that slows oxygen diffusion. Think about It Why are some obligate anaerobes able to grow in tissues e.
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