Question

disscuse the resons to study virus

Answer 1

documentation ( early writings record

origins of viruses: Fossils, _____________ measles, flu, hepatitis and diarrhoea outbreaks , isolates from the past (very few)

genomic fossils

_____________ viruses sometimes integrate with a host DNA and reminants of many thousands are detectable in our own DNA

use of unusual nucleic acids

theories of the origins of viruses: must account for extreme dependence on host cell, _____________, Lack of cell structure, origin of capsid

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mitochondria and chloroplasts

theories of the origin of viruses : possibilities - degenerative bacteria _____________

Mobile genetic elements

theories of the origin of viruses: possibilities - _____________ escape from cells, bacteriophages Mu fits transposon and virus definitions

helps explain RNA viruses

theories of the origin of viruses: possibilities - simultaneously: evolution with life itself _____________

DNA and RNA viruses

theories of the evolution of viruses: possibilities - likely that _____________ have different origins; viruses may have appeared independently several times

degeneracy

origin of viruses: viruses may be derived from pro or eukaryotic cells that have dispensed with many of their functions - _____________