prf B (programmed ribosomal frameshift)—> Codes for release factor 2.
The ribosomes fall off at a specific stop codon (UGA, UAA): RF2 identifies these
PRFB gene codes for release factor 2 which's job is to recognize these two stop codons and detach the RNA from the mRNA
Genetic material of viruses:
- Can be DNA or RNA
- Variety of viral genome sizes:
- Smallpox: DNA genome ~ 300,000 pbs long
(300-1500 genes coding for different proteins)
- Polio: RNA genome ~ 3,00 bps long
(3-15 genes coding for different proteins)
generally: 1 gene ~ 1,000 bps long
Viroid: independently replicating circle of DNA
Protein coat= capsid
—> Made of capsomeres: small, repeating protein units that make up capsid
- genes for capsomeres in viral genomes
Enveloped Viruses:
- Many, though not all eukaryote-infecting viruses have a phospholipid bilayer membrane
Glycoproteins
- attach virus to host cell
- attach membrane to capsid in enveloped viruses
Kassie Hein
