For instance , a number of RNA viruses ( such as poliovirus ) use this type of enzyme to replicate their genetic material .
There are also a number of RNA - dependent RNA polymerases that use RNA as their template for synthesis of a new strand of RNA .
A number of RNA viruses ( such as poliovirus ) use this type of enzyme to replicate their genetic material .
There are also a number of RNA - dependent RNA polymerases that use RNA as their template for synthesis of a new strand of RNA .