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SIZE - MEASURED IN NANOMETERS SUB-LIGHT MICROSCOPIC 4 MAJOR GROUPS 1. ANIMAL 2. PLANT 3. BACTERIAL 4. VIRUSES OF EUCARYOTIC MICROBES FUNGI AND PROTISTA COMMON CHARACTERISTICS OF VIRUSES. ALL ARE OBLIGATE INTRACELLULAR PARASITES
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SIZE - MEASURED IN NANOMETERS SUB-LIGHT MICROSCOPIC 4 MAJOR GROUPS 1. ANIMAL 2. PLANT 3. BACTERIAL 4. VIRUSES OF EUCARYOTIC MICROBES FUNGI AND PROTISTA COMMON CHARACTERISTICS OF VIRUSES
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
VARIABILITY OF VIRUSES TYPE OF NUCLEIC ACID CIRCULAR, LINEAR, DS, SS, IN SEGMENTS MORPHOLOGY OF CAPSID
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
IS THERE EVER ANYTHING ELSE IN THE CORE IN ADDITION TO THE NUCLEIC ACID? • INTRACELLULAR REPLICATION
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