Components of the viral genome
Viral genomes are either made of DNA or RNA, and can be single-stranded or double-stranded.
The genomes can also be linear, circular or segmented (in several parts).
Single stranded RNA genomes are classified as positive or negative.
- Positive strands are translated directly into proteins.
- Negative strands cannot be translated directly. A positive strand must be created through replication of the RNA before proteins can be synthesised.
The type of genome possessed by the virus influences its method of replication within a host cell.