A) W M Stanley
B) Louis Pasteur
C) Edward Jenner
D) Andre Lwoff
Correct Answer: A
Solution :
Biologist first began to suspect the existence of viruses during end of 19th 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.
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