Imagine that you have discovered a new form of microbial life, one that appears to represent a fourth domain. How would you go about characterizing the new organism and determining if it actually is evolutionarily distinct from Bacteria, Archaea, and Eukarya?
Answer to relevant QuestionsWhat are the major differences between oxygenic and anoxygenic phototrophs? Give an example of a fermentation that does not employ substrate-level phosphorylation. How is energy conserved in this fermentation? How do monooxygenases differ from dioxygenases in terms of the reactions they catalyze? Why are oxygenases necessary for the aerobic catabolism of hydrocarbons? Compare and contrast the utilization of H2S by a purple phototrophic bacterium and by a colorless sulfur bacterium such as Beggiatoa. What role does H2S play in the metabolism of each organism? Compare and contrast the nitrogen metabolism of nitrifiers with that of denitrifiers.
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