a diyana abdullah 11 éve
767
CELL WALL
Viruses are acellular microorganisms significantly smaller than bacteria, characterized by their dependency on living cells to multiply. They contain a single type of nucleic acid, either DNA or RNA, and are surrounded by a protein coat called a capsid.
Megnyitás
ACELLULAR MICROORGANISM (VIRUSES) Viral structure Other Body Tail Spike envelope Covered the capsid Made up of:
Carbohydrate
Protein
Lipid
Capsid Protein coat surrounding nucleic acid Nucleic acid RNA segmented ds
segmented
ss
DNA Circular
Linear
ds, ss
Structure of virus Virus Family RNA viruses Release through rupture of host cell Orthomyxoviridae
Influenza C virus
Deltaviridae
Hepatitis D virus
Paramyxoviridae
Morbillivirus
Paramyxovirus
Filoviridae
Filovirus
Rhabdoviridae
Lyssavirus
Vesiculovirus
Coronaviridae
Coronavirus
Flaviviridae
Hepatitis C virus
Togaviridae
Rubivirus
Alphavirus
Multiplication occurs in cytoplasm DNA viruses DNA are release into the nucleus of infected host cell Caliciviridae
Norovirus
Hepatitis E virus
Picornaviridae
Hepatitis A virus
Rhinovirus
Enterovirus
Hepadnaviridae
Hepadnavirus
Herpesviridae
Cytomegalovirus
Poxviridae
Molluscipoxvirus
Orthopoxvirus
Papovaviridae
Polyomavirus
Papillomavirus
Adenoviridae
Mastadenovirus
Parvoviridae
Human parvovirus
Taxonomy Characteristics to divide viruses into taxonomic group 6. Number of capsomers in icosahedral viruses 5. Diameter of the virion or nucleocapsid 4. Presence of envelope 3. Capsid symmetry 2. Nucleic acid characteristics 1. Nature of host Names of virus Genus and sp. = virus Subfamily = ends with virinae Family = ends with viridae Morphology Complex viruses Enveloped viruses Enveloped polyhedral viruses Simplexvirus
Enveloped helical virus Influenzavirus
Polyhedral viruses Poliovirus Adenovirus Helical viruses Ebola virus Size Size comparision Bacteriophages Replication/Multiplication Lysogenic cycle Host remain alive
Lytic cycle Host die
Host Specific Narrow range Can infect Fungi Bacteria Protist Plant Vertebrae invertebrae General characteristics Multiply inside living cell Contain protein coat Single type nucleic acid never both DNA or RNA Obligate intracellular parasite Smaller than bacteria Latin word "poison" Classification According to International Committee for Taxonomy or Virus e. Type of host d. Presence/absence of envelope c. The sense (+ve/-ve) of ssRNA b. Nucleic acid strandedness a. Nucleic acid type
