lectures_28-o-_synopsis-2009 - Mic 140 Lectures 28...

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Mic 140 Lectures 28 Synopsis. Oxygen - or lack thereof - regulation of metabolic activity and growth I. Oxygen in biology A. Significant production of oxygen is only by organisms with an oxygenic photosynthetic mechanism (cyanobacteria and chloroplasts), in contrast to those with an anoxygenic photosynthetic mechanism (purple and green bacteria) that do not produce oxygen. B. The presence or absence of oxygen in the growth environment is referred to as oxic (+) and anoxic (-), respectively. C. A metabolic requirement, or not, for oxygen is referred to as aerobic (+) or anaerobic (-), respectively. 1. Oxygenic photosynthesis will make an environment oxic, while a high rate of aerobic respiration will make an environment anoxic. Non-photosynthetic organisms can be obligate aerobes, facultative anaerobes or obligate anaerobes. The most interesting, from a regulatory perspective, are the facultative anaerobes that can metabolize in the presence or absence of oxygen. II.
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This note was uploaded on 12/02/2009 for the course MIC 140 taught by Professor Meeks,singer during the Spring '09 term at UC Davis.

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lectures_28-o-_synopsis-2009 - Mic 140 Lectures 28...

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