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Q.
The tobacco mosaic virus was crystallized for the first time by
Chhattisgarh PMTChhattisgarh PMT 2006
Solution:
Biologist first began to suspect the existence of viruses during end of $19^{th}$ century. The true nature of viruses was discovered in $1933$ when Wendell Stanley prepared an extract of a plant virus called Tobacco Mosaic Virus (TMV) and purified it in the form of crystals. Stanley concluded that TMV is best regarded as just that chemical matter than a living organisms.