Compare and contrast the physical and chemical conditions on Earth at the time life first arose with conditions today. From a physiological standpoint, discuss at least two reasons why animals could not have existed on early Earth. In what ways has microbial metabolism altered Earth’s biosphere? How might life on Earth be different if oxygenic photosynthesis had not evolved?
Answer to relevant QuestionsFor the following sequences, construct the phylogenetic tree that best depicts their evolutionary relationships. Taxon 1: ......... GTTCCCTTA Taxon 2: ......... GTTCGGTAT Taxon 3: ......... GAAAAACCCTAT Taxon 4: ...Define the term substrate-level phosphorylation. How does it differ from oxidative phosphorylation? What compound(s) do fermentative bacteria need to synthesize in order to make ATP by substrate-level phosphorylation? What are the functions of light-harvesting and reaction center chlorophylls? Why would a mutant incapable of making light harvesting chlorophylls (such mutants can be readily isolated in the laboratory) probably not be a ...How does the reduction potential (E0′) of chlorophyll a in PSI and PSII differ? Why must the reduction potential of PSII chlorophyll a be so highly electropositive? What are some ecological strategies that aerobic sulfide-oxidizers use to compete with the chemical oxidation of H2S by atmospheric O2?
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