Image by flutie8211 on Pixabay · Pixabay License
non-cellular life
Sign in to saveAlso known as Acellular, Acytota
life that exists without a cellular structure, such as virusses, viroids, etc.
Species
Aphanobionta (sinonim: Acytota; virusi i viroidi), naziv za viruse i viroide, najsitnije čestice u sustavu Biota. Uzročnici su bolesti kako kod životinja i biljaka tako i kod bakterija i archaea (prabakterija). Ni virusi kao ni još sitniji viroidi nemaju stanične strukture, a repliciraju se samo unutar neke druge stanice. Postoje glavne dvije domene: a) Aminoacuea koji obuhvaća diviziju Priones sa rodovima BSE, kuru i Scrapie i b) Nucleacuea sa virusima i viroidima. U novije vrijeme publiciran je klasifikacijski sustav koji podrazumijeva pet domena, od čega dvije domene obuhvaćaju bezstanične organizme: Prionobiota (bezstanični organizmi bez nukleinske kiseline) i Virusobiota (bezstanični organizmi sa nukleinskom kiselinom.
via
~5 min read
Encyclopedic overview
An illustration produced by the CDC of the ultrastructure of a SARS-CoV-2 virus as viewed using electron microscopy
Non-cellular life, also known as acellular life, is life that exists without a cellular structure for at least part of its life cycle. Historically, most definitions of life postulated that an organism must be composed of one or more cells, but, for some, this is no longer considered necessary, and modern criteria allow for forms of life based on other structural arrangements.
Excerpted from Wikipedia’s “non-cellular life” article, available under the CC BY-SA 4.0 licence.