Virology

1- Explain the Baltimore classification of viruses and the type of nucleic acid found in virions of each type. Give one example of each of the groups.
2-Compare and contrast the four types of nucleic acid polymerases and give an example of each .
3-What is the molecular mechanism of RNA replication in poliovirus ?
4-Briefly describe the three ways in which mRNAs are processed in the nuclei of eukaryotic cells.