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biology of prions Dr. Stanley Prusiner coined the term prion in 1982, which he defined as a small infectious pathogen containing protein but apparently lacking nucleic acid . The prion protein (PrP) is the critical component of these agents and may, in fact, be its exclusive constituent.
Other viruslike particles called prions are composed primarily of a protein tightly integrated with a small nucleic acid molecule. Viruses are generally classified by the organisms they infect, animals, plants, or bacteria.ucleic Acid-Just as in cells, the nucleic acid of each virus encodes the genetic information for the synthesis of all proteins. While the double-stranded DNA is responsible for this in prokaryotic and eukaryotic cells, only a few groups of viruses use DNA.