Hello
everyone! Last Friday, I learnt about Viruses with Dr. Wan. There are
4 cellular agents that we should know which is viruses, viroids,
satellites, and prions. Viruses are :
- major cause of disease
- important members of aquatic world
- important in evolution
- important model systems in molecular biology
Virion
size is about 10-40nm is diameter. They contain nucleocapsid and
protein coat. Capsids can be in helical, icosahedral and complex.
Envelope protein which are viral encoded may project from the
envelope surface as spikes or peplomers. A virus may have single or
double stranded DNA or RNA. Genomes can also be segmented or
circular.
The
steps for viral multiplication started with attachment to host cell,
entry, uncoating of genome, synthesis, assembly and release. Next,
types of viral infections can either be infections in bacteria and
archaea, infections in eukaryotic cells or viruses and cancer. Did
you know? Oncogenes is a cancer causing genes and it may come from
the virus or may be transformed host proto-oncogenes.
The
cultivation of viruses requires inoculation of appropriate living
host. Viroids can cause plant disease!!
