What did W.M. Stanley demonstrates about viruses?

What did W.M. Stanley demonstrates about viruses?
  1. They can be crystallized
  2. They are inert outside their specific host cell
  3. They are obligate parasites
  4. All of the above

Solution

W.M. Stanley showed that viruses could be crystallized and crystals consist largely of proteins. They are inert outside their specific host cell. Viruses are obligate parasites.

Asked in: NCERT

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