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Diversity121_OLS - Microbial Diversity Prokaryotic cells vs...

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Microbial Diversity Prokaryotic cells vs Eukaryotic cells Principle differences: 1. Eukaryotic cells have a membrane-bound (true) nucleus, while prokaryotic cells lack a true nucleus 2. Eukaryotic cells have organelles in their cytoplasm: mitochondria, endoplasmic reticulum, Golgi bodies, etc., while prokaryotic cells lack organelles Prokaryotic Microorganisms “True” Bacteria (Eubacteria) 1. Bacteria are unicellular 2. Bacteria (except for Mycoplasmas ) have cell walls made of peptidoglycan 3. Bacteria have “normal” cell membranes and ribosomal RNA 4. Bacterial species have been found in a large variety of environmental niches 5. Bacterial species are capable of using a wide variety of substances for nutrition Although the vast majority use nutrients produced by other organisms, several species of bacteria can produce food via photosynthesis (for example, cyanobacteria and purple sulfur bacteria) Archaea 1. Archaea are unicellular 2. Archaeal cell walls LACK peptidoglycan 3.
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