Microbial Life: Prokaryotes and Protists - Renz Science

16.8 Archaea thrive in extreme environments—and in other habitatsFigure 16.8A Archaeal inhabitants of extreme environmentshave unusual proteins and other molecularadaptations that enable them to metabolize andreproduce effectively.– Extreme halophiles thrive in very salty places.– Extreme thermophiles thrive in– very hot water, such as geysers, and– acid pools.© 2012 Pearson Education, Inc.16.8 Archaea thrive in extreme environments—and in other habitatsFigure 16.8B Methanogens– live in anaerobic environments,– give off methane as a waste product from– the digestive tracts of cattle and deer and– decomposing materials in landfills.© 2012 Pearson Education, Inc.16.9 Bacteria include a diverse assemblage ofprokaryotes The domain Bacteria is currently divided into fivegroups, based on comparisons of geneticsequences. 1. Proteobacteria– are all gram negative,– share a particular rRNA sequence, and– represent all four modes of nutrition.16.9 Bacteria include a diverse assemblage ofprokaryotes– Thiomargarita namibiensis is a type of proteobacteriathat– is a giant among prokaryotes, typically ranging up to100–300 microns in diameter,– uses H 2 S to generate organic molecules from CO 2 ,and– produces sulfur wastes, seen as small greenishglobules in the following figure.© 2012 Pearson Education, Inc.© 2012 Pearson Education, Inc.9