Microbial Life: Prokaryotes and Protists - Renz Science

Figure 16.9A16.9 Bacteria include a diverse assemblage ofprokaryotes– Proteobacteria also include Rhizobium species that– live symbiotically in root nodules of legumes and– convert atmospheric nitrogen gas into a form usableby their legume host.– Symbiosis is a close association betweenorganisms of two or more species.– Rhizobium is an endosymbiont, living within anotherspecies.© 2012 Pearson Education, Inc.Figure 32.13B16.9 Bacteria include a diverse assemblage ofprokaryotesShoot 2. Gram-positive bacteria– rival proteobacteria in diversity andBacteria withinNodulesvesicle in anRootsinfected cell– include the actinomycetes common in soil.– Streptomyces is often cultured by pharmaceuticalcompanies as a source of many antibiotics.© 2012 Pearson Education, Inc.Figure 16.9B16.9 Bacteria include a diverse assemblage ofprokaryotes 3. Cyanobacteria– Cyanobacteria are the only group of prokaryotes withplantlike, oxygen-generating photosynthesis.– Some species, such as Anabaena, have specializedcells that fix nitrogen.© 2012 Pearson Education, Inc.10