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Give a brief account of viruses, mentioning structure & nature of genetic material. Name any four viral diseases.
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Viruses are not truly living, they are non-cellular organism. Once they enter the host cell, they become active & replicate. The name has been taken from venom= poison (Name was given by Pasteur). D.J. Ivanowsky in 1892 identified then from mosaic disease of tobacco.
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