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W. M. Stanley demonstrated in 1935 that viruses could be crystallised. The crystals consisted largely of proteins, and viruses were found to remain inert outside their specific host cells.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
Viruses contain genetic material in the form of either RNA or DNA. No virus contains both RNA and DNA. The nucleic acid is enclosed by a protein coat called the capsid.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Viruses Viroids Prions and Lichens
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