What is virus? VIRUS V.S VIROID

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 What is viruses 

Bacteriophage T4 infecting some bacteria. Illustration Credit: Andrea Danti / Shutterstock

All of us who have suffered the ill effects of common cold or "flu" know what effects viruses can have on us, even if do not associate it with our condition. Viruses did not find place in classification since they are not considered truly 'living' if we understand living as those organism that have a cell structure. The virus are non cellular organism that are characterised by haveing an inest   crytalline struture outside of living cell. 

    Once they infect a cell they take over the machinery of host cell to replicate themselves, killing the host.

No virus contain both RNA DNA. A virus is a nucleoprotein and the genetic material is infectious. Virus that infect plant have single stranded RNA and virus that infect animal have either single or double RNA or double DNA.

          Viruses cause diseases like mumps, small pox, herpes, and influnza. AIDS in human also cause by virus.

VIROIDS

    In 1971, T.O. Diener discovered a new infectious agent that was smaller than virus and cause potato spindle tuber disease. It found to be free RNA; it lacked the protein coat that is found in viruses, hence the name is viroid. The RNA of the viroid was of low moleculer weight.


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