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Unformatted text preview: Photosynthetic cells 2. Nitrogen-fixing cells heterocytes Concept 27.4: Molecular systematic is illuminating prokaryotic phylogeny-A tentative phylogeny of some of the major taxa of prokaryotes based on molecular systematic Prokaryotic Domains-Comparison of traits found in the Domains Bacteria & Archaea Domain Bacteria-Proteobacteria 1. Alpha 2. Beta 3. Gamma 4. Delta 5. Epsilon-Chlamydias-Spirochetes-Gram-positive bacteria-Cyanobacteria Archaeans are often found in extreme environments-Thermophiles thrive in very hot environments-Barophiles thrive under high pressure-Methanogens live in anoxic environments(e.g. swamps & marshes); produce methane as waste product-Halophiles live in high saline environments...
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- Spring '08