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Chapter_27_to_post - Chapters 27 The Hidden World of...

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Chapters 27 The Hidden World of Microbes
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Microbes: too small to be seen clearly without a microscope
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Microbes prokaryotes range in size 0.2-1.0 µm
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Microbes prokaryotes unicellular eukaryotes range in size 10- 100µm How big is a µm or “micrometer”?
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Microbes prokaryotes unicellular eukaryotes range in size 10- 100µm How big is a µm or “micrometer”? = 1/1,000,000 of a meter = the ‘period’ at end of sentence is about 1000 µm
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Size comparison of prokaryotes, eukaryotes and viruses
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Other biological entities: even smaller than bacteria
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Other biological entities NOT organisms because the don’t have all of the characteristics of living organisms
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Other biological entities not organisms Viruses: small (0.05-0.2 µm) and come in many different shapes
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Other biological entities not organisms Viruses 2 parts :
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Other biological entities not organisms Viruses parts: 1. genome = genetic information. Can be either single-stranded or double stranded DNA or RNA.
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Other biological entities not organisms Viruses parts: 1. genome 2. capsid = protein coat which surrounds and protects genome
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Other biological entities not organisms Viruses parts: 1. genome 2. capsid 3. envelope = membrane (phospholipid bilayer) which surrounds the capsid.
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Other biological entities not organisms Viruses parts: 1. genome 2. capsid 3. envelope hijack cells
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Other biological entities not organisms Viruses parts: 1. genome 2. capsid 3. envelope hijack cells highly specific for organism it infects
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Bacterium Bacterium Newly forming Newly forming bacteriophages bacteriophages bacteriophage bacteriophage
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Other biological entities not organisms Viruses Viroids even simpler and smaller than viruses
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This note was uploaded on 05/13/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter_27_to_post - Chapters 27 The Hidden World of...

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