MBIO 1010 Lecture Notes - Lecture 17: Rickettsia Rickettsii, Gammaproteobacteria, Intracellular Parasite
8 May 2017
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Document Summary
Most prokaryotes cannot be cultured in the lab (yet) . Some phyla are well studied in the lab . Impressive morphological diversity, generally larger than other bacteria: o unicellular, filamentous, or branching filamentous . Some form heterocysts specialized nitrogen fixing cells . All are autotrophs fix co2 to build cell material . Like chloroplasts they carry out photosynthesis in specialized membranes called thylakoids . Unlike chloroplasts they have cell walls: : contain peptidoglycan. Widely distributed in terrestrial, freshwater, and marine habitats . One of the most abundant organisms on earth. Accounts for ~ half of photosynthesis in the world"s o(cid:272)ea(cid:374)s. Includes many of encountered bacteria the most commonly. Facultative organisms that can switch from one metabolic lifestyle to another. Alpha-, beta-, gamma-, are well studied with many important species . Delta-, epsilon- are smaller classes mostly known for some (cid:862)stra(cid:374)ge(cid:863) (cid:271)a(cid:272)teria . Zetaproteobacteria has barely been studied with only one known species .
