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VIRUSES: GENERAL PHYSICOCHEMICAL PROPERTIES & CLASSIFICATION (Viral…
VIRUSES: GENERAL PHYSICOCHEMICAL PROPERTIES & CLASSIFICATION
Kingdom of Life
Eukaryotic Unicellular
: Protozoa, Protista, Alga
Prokaryotic Unicellular
: Eubacteria, Archaea, Monera/Prokaryotae
Eukaryotic, Multicellular
: Plants, Fungi, Animal
Non-Cellular Structure (Organisms)
Viroid
: Virus without coat protein
Prion
: protein molecule which can replicate
Virus
: Nucleic acid genome with protein coat
History of Viruses
Viral Characteristics
Obligate intracellular parasite
Small size - range 30 ~ 300nm
No energy generating system
Many shapes. Eg: cylindrical, icosahedral
Genome: 1//2 strands (DNA//RNA)
Many variations in DNA sequences
Does not undergo binary fission
Variety of hosts
DNA//RNA genome (but not both)
Host of Viruses
Specificity
Limited hosts
Hosts within the same species
Only 1 species
Different species & interact with different organisms
Varieties of Hosts
: Animals, Plants, Fungi, Bacteria
Components of Virions
: Infectious virus particles
Capsid (protein coat)
: protein subunit protein=
capsomere
, nucleic acid + capsid =
Nucleocapsid
, different size & types
Lipoprotein envelop (in some viruses)
: Derived from host cell membrane,
glycoprotein spikes
Nucleic Acid
: DNA//RNA, 1//2 stranded of genome molecules.
