02 Overview of Microbial Life .pptx - Survey of Microorganisms • Microorganisms may be either prokaryotic or eukaryotic • Prokaryotic cells lack

02 Overview of Microbial Life .pptx - Survey of...

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Survey of Microorganisms Microorganisms may be either prokaryotic or eukaryotic Prokaryotic cells lack intracellular compartmentation of biochemical functions (organelles) Small cells; usually 1-5 µm in dimension
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Introduction to Microbiology Eukaryotic cells are more structurally complex Larger cells; >5µm in diameter Eukaryotic microorganisms are often multicellular
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Comparison of Prokaryotic and Eukaryotic Cells Characteristic Prokaryotes Eukaryotes Nucleus Absent Present Membranes Plasma membrane Plasma and organelle membranes Chromosome structure Usually single closed circular Multiple linear segments Organelles Usually absent Present in variety of forms Ribosomes Smaller; free and bound to cell membrane Larger; free and bound to ER Cytoskeleton Present Present Cell walls Present; made of peptidoglycan-imp in survival: penicillin prevents its synthesis In plants, algae and fungi; cellulose or chitin Flagella Rotating Whipping Cilia Absent In some cells
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Microbial Taxonomy Carolus Linnaeus Published first taxonomic system in 1735 Developed binary system of nomenclature for organisms Classified organisms as Plantae or Animalia
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Microbial Taxonomy Ernst Haeckel In 1866, added a third kingdom, Protista Included all microorganisms Bacteria Algae Protozoans Fungi
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  • Spring '14
  • LawrenceR.Aaronson

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