RNA viruses do not have DNA; genetic information encoded in RNA. RNA can be single and double stranded, and the host cell can be pro or eukaryotic. Only viruses with single-stranded RNA infect bacteria, and eukaryotic viruses can be either single or double-stranded.
Replication is carried out by RNA replicase, producing copies of RNA for new virions. The synthesis of the capsid protein occurs only after the infected RNA cell undergoes some modification, which makes it possible to attach the ribosomes of the cell to the RNA site that encodes this protein. Virion assembly begins with the formation of disks from a capsid protein. Two of these protein disks, concentrically arranged, form a biscuit-like structure, which after binding to it, the RNA takes the form of a spiral. Subsequent attachment of protein molecules continues until the RNA is completely coated. In its final form, the virion is a 300 nm cylinder.
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