<Li> Viruses with complex transcription, for which subgenomic mRNAs, ribosomal frameshifting, and proteolytic processing of polyproteins may be used . All of which are different mechanisms with which to produce proteins from the same strand of RNA . </Li> <P> Examples of this class include the families Astroviridae, Caliciviridae, Coronaviridae, Flaviviridae, Picornaviridae, Arteriviridae, and Togaviridae . </P> <P> The negative - sense RNA viruses and indeed all genes defined as negative - sense cannot be directly accessed by host ribosomes to immediately form proteins . Instead, they must be transcribed by viral polymerases into a "readable" form, which is the positive - sense reciprocal . These can also be divided into two groups: </P> <Ul> <Li> Viruses containing nonsegmented genomes for which the first step in replication is transcription from the (-) - stranded genome by the viral RNA - dependent RNA polymerase to yield monocistronic mRNAs that code for the various viral proteins . A positive - sense genome copy is then produced that serves as template for production of the (-) - strand genome . Replication is within the cytoplasm . </Li> <Li> Viruses with segmented genomes for which replication occurs in the nucleus and for which the viral RNA - dependent RNA polymerase produces monocistronic mRNAs from each genome segment . The largest difference between the two is the location of replication . </Li> </Ul>

Which of the following are parameters of classification by the baltimore model of viral content