User:Mohmmad gulzar

VIRUSES

Viruses is a group of ultramicroscopic, non cellular highly infectious agents that multiple only intracellularly inside the living cell without involving growth and division.

GENERAL CHARACTER OF VIRUSES


 * Viruses are non cellular ultramicroscopic infectious agents.


 * They are highly pathogenic and cause infectious disease in animals and plants.
 * They are easily transmitted from one organism to another by means of a vector. The virus is transmitted by arthropod is called adenovirus.
 * they are perfect obligate parasites and cannot be grown on artificial culture they are inert outside the host cell.
 * Viruses can be various shaped
 * 1) Spherical- AlFalfa mosaic virus, foot and mouth virus
 * 2) Cubical - Vaccinia
 * 3) Elongated rod shaped - tobacco mosaic virus
 * 4) Polyhedral- polio, turnip yellow mosaic
 * 5) Tadpole like (bacteria virus T2)