BIOLOGICAL CLASSIFICATION
VIRUSES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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TRUE:Viruses can cause a wide range of infections.
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FALSE:Scientists have discovered ways of using viruses as tools in reasearch
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Either A or B
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None of the above
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Detailed explanation-1: -Two scientists contributed to the discovery of the first virus, Tobacco mosaic virus. Ivanoski reported in 1892 that extracts from infected leaves were still infectious after filtration through a Chamberland filter-candle.
Detailed explanation-2: -Which of the following statements about viruses is FALSE?-Viruses contain DNA or RNA but never both.
Detailed explanation-3: -The first evidence of the existence of viruses came from experiments with filters that had pores small enough to retain bacteria. In 1892, Dmitri Ivanovsky used one of these filters to show that sap from a diseased tobacco plant remained infectious to healthy tobacco plants despite having been filtered.
Detailed explanation-4: -The correct answer is B. Viruses do not eat food, but they live inside the cells of their hosts.