5 - Bacteriophages(phages)areobligate machinery. bacteria...

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    Chapter 4  bacteriophage
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Bacteriophages ( phages ) are obligate  intracellular parasites that multiply  inside bacteria by making use of some  or all of the host biosynthetic  machinery . They are viruses that infect  bacteria.
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Composition of Bacteriophage  Nucleic acid: either DNA or RNA but not  both ds DNA, ss RNA, ss DNA  unusual or modified bases encode 3-5 gene products to over 100 gene  products  Protein: function in infection and protect  the nucleic acid  
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Structure of Bacteriophage   different sizes and shapes  icosahedral  二二二二 filamentous 
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Tail Tail Fibers Base Plate Head Contractile Sheath Capsid DNA
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Types of Bacteriophage Lytic or Virulent Phages 毒毒毒毒毒 Lysogenic or Temperate Phage 毒毒毒毒毒毒毒毒毒毒毒毒
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Lytic or Virulent Phages Definition:         Lytic or virulent phages  are phages  which can only multiply in bacteria and  kill the cell by lysis at the end of the life  cycle. 
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