11:680:390 Lecture Notes - Lecture 12: Horizontal Gene Transfer, Phototroph, Convergent Evolution
13 Mar 2018
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Form and function as related to microbial physiology and ecology. Q: which of the following processes might explain why sulfate reduction is found only in a few representatives of 5 different phyla: gene loss, convergent evolution, horizontal gene transfer, all of the above. O2; in filamentous cyanobacteria, a cell (heterocyste) that specializes in n2 fixation provides fixed n (glutamate) to neighboring cells. Substrates (photosystem ii: obtain energy from light, but reducing power can come from organic or. C inorganic sources: the first phototrophs to live on earth, habitat - anoxic environments that are exposed to light, highly diverse: phylogeny, pigments, electron donors, photosystems, mechanisms of co 2 fixation. Filamentous cyanobacteria that fix nitrogen have heterocysts, specialized cells that do not perform photosynthesis and have thick cell walls that reduce exposure to the oxygen in the environment where the microbe lives.
