How many of the following statements are NOT true?
(i) No virus contains both DNA & RNA
(ii) Viruses couldn’t pass through bacteria – proof filters
(iii) W.M. Stanley showed that viruses could be crystallised
(iv) T.O. Diener discovered viroids

One

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Two

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Three

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Four

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Solution

The correct option is A One
Viruses are smaller than bacteria and hence can pass through bacteria – proof filters.

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