Which of the following characters for virus are incorrect from given characters?
(i) These were found to be smaller than bacteria because they passed through bacteria-proof filters.
(ii) M.W. Beijerinck (1898) called virus as Contagium vivum fluidum.
(iii) W. M. Stanely (1935) showed that viruses could be crystallised and crystals consist largely of proteins.
(iv) Viruses are facultative parasites.
(v) A virus is a nucleoprotein and the genetic material is infectious.
Text Solution
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(i) Smaller than bacteria: Correct. Viruses pass through bacteria-proof filters.
(ii) M.W. Beijerinck (1898): Correct. He coined "Contagium vivum fluidum" (infectious living fluid).
(iii) W. M. Stanely (1935): Correct. He showed that viruses could be crystallized and consist largely of proteins.
(iv) Viruses are facultative parasites: Incorrect. Viruses are obligate intracellular parasites, meaning they cannot survive or replicate independently outside a host cell. They cannot act as saprophytes, so they are not facultative.
(v) Nucleoprotein/infectious: Correct. Viruses consist of genetic material (DNA or RNA) and protein, and the genetic material is infectious.
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