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Lecture 16

MICB 201 Lecture 16: The Heterotrophic Way of Life

3 Pages

Course Code
MICB 201
Wade Bingle

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Chapter 9: The Heterotrophic Way of Life 9.1 Definition and distribution Heterotroph An anabolic term Strict definition: An organism that uses an organic nutrient as a source of carbon Most also use organic nutrients as sources of energy and electrons Reminder: in MICB 201, a heterotroph = an organism that uses an organic nutrient as sources of Carbon, Energy, Electrons Widely distributed in nature Almost all of LPSN phyla have heterotrophic members 9.2 Energy, electron and C-sources Glucose and Glycolysis Many heterotrophic prokaryotes have NO use for glucose as an organic nutrient. Not all prokaryotes that can use glucose metabolize it using the set of E-catalyzed reactions called Glycolysis The heterotrophic prokaryotic world is much more metabolically diverse than the heterotrophic eukaryotic world Specialized and versatile heterotrophs Evolution has produced heterotrophs which range from specialized to versatile Obviously relative terms Very specialized: Restricted to the use of a few chemically related organic nutrients as energy, electron and C-sources. Very versatile: Use a wide variety of organic nutrients as energy, electron and C- sources. Versatility is more common than specialization in the heterotrophic prokaryotic world that we know now Example of specialized heterotrophs: methylotrophs Most are Proteobacteria Only use 1-C molecules for energy, electrons and C Includes methane (greenhouse gas) Consider the use of methane for energy production by some aerobic methylotrophs
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