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• SIZE - MEASURED IN NANOMETERS• SUB-LIGHT MICROSCOPIC• 4 MAJOR GROUPS
1. ANIMAL 2. PLANT3. BACTERIAL4. VIRUSES OF EUCARYOTIC MICROBES
• FUNGI AND PROTISTA
• COMMON CHARACTERISTICS OF VIRUSES
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• ALL ARE OBLIGATE INTRACELLULAR PARASITES
• ALL HAVE NO INDEPENDENT METABOLIC PATHWAYS FOR ENERGY SYNTHESIS
• THEY ALL POSSESS ONLY ONE NUCLEIC ACID - RNA OR DNA NEVER BOTH
• THEY ALL HAVE A COMMON BASIC STRUCTURE SEEN IN 1942 WITH EM
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• VARIABILITY OF VIRUSES– TYPE OF NUCLEIC ACID
• CIRCULAR, LINEAR, DS, SS, IN SEGMENTS– MORPHOLOGY OF CAPSID
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• N SPIKES – NEURAMINIDASE • H SPIKES – HEMAGGLUTININ • H1N1 – 1918 – FLU VIRUS
– Killed 40 – 50 million people world wide• H5NI – TODAYS BIRD FLU• Indonesia - killed 7 people• Swine flu virus
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• IS THERE EVER ANYTHING ELSE IN THE CORE IN ADDITION TO THE NUCLEIC
ACID?• INTRACELLULAR REPLICATION
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• CLASSIFICATION OF VIRUSES - INTERNATIONAL COMMITTEE ON TAXONOMY OF VIRUSES (ICTV) - 1966
• TAXONOMIC LEVELS• ORDER, FAMILY,GENUS,SPECIES• NUCLEIC ACID• MORPHOLOGY• PRESENCE OR ABSENCE OF AN ENVELOPE• STRATEGY OF REPLICATION