21. ;RNA viruses : Replication usually takes place in the cytoplasm. 22. A small number of positive-strand RNA viruses have been described. 23. The majority of fungal viruses are double-stranded RNA viruses . 24. Polio is also caused by an RNA virus , but nearly eliminated due to vaccine efforts. 25. Morphologically, the virus is a double stranded RNA virus that is composed of ten segments. 26. All RNA viruses use their own RNA replicase enzymes to create copies of their genomes. 27. Infection by RNA viruses can trigger the RNAi cascade. 28. Positive-stranded RNA virus transcription is the method of transcription. 29. Like all RNA viruses , it contains a protein capsid which protects the inner viral RNA. 30. Replication follows the positive stranded RNA virus replication model.
