Virus ;
*The different group of microbes like Bacteria, Fungi , Virus and Protozoa have been primarily consider to be an important tool in genetic engineering.
Virus - Literally virus means 'poison'
*They were first recognized in 1892 by Iwanosky - as " infectious agent ".
They were visible only under Electron microscope.
*Virus are total parasites of living host & show their living characteristics it can multiply with in the host cell.
*They cannot be cultured in media.
*The body in none - cellular without any typical cell structure & it's made up of Nucleo protein molecule.
*Protein form of coat & Nucleic acid constitute the core.
*This core may be either DNA / RNA
They may be different size & shapes.
The size range from 20 nm to 300 nm.
*Present in Oval , rod , polygon etc .
*Virus that affects bacteria - Bacteriophage.
*Presence of virus in a host can be visualize when the tissue extract is spread in agar medium & distinct zones of virus are seen - called plaques.
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