Using the phylogenetic tree in Figure 16.1 as a guide, discuss what indicates that bacteriorhodopsin may have been a late evolutionary invention and that anaerobic respiration with S0 as electron acceptor might have been an early evolutionary invention.
Answer to relevant QuestionsDefend or refute the following statement: The upper temperature limit to life is unrelated to the stability of proteins or nucleic acids. Distinguish between a primary and a secondary endosymbiosis. Which groups of protists are derived from which form of endosymbiosis? Why is environmental proteomics limited by natural abundance of microbial populations, whereas environmental genomics and metatranscriptomics are not so limited? Can nucleic acid probes in microbial ecology be as sensitive as culturing methods? What advantages do nucleic acid methods have compared with culture methods? What disadvantages? Many pelagic prokaryotes can use light energy but are not considered “phototrophs” in the same sense as cyanobacteria or purple bacteria. Explain.
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