NEETBotanyBiological Classification
What did W.M. Stanley demonstrates about viruses?
Options
- AThey can be crystallized
- BThey are inert outside their specific host cell
- CThey are obligate parasites
- DAll of the above
Correct answer
D. All of the above
Step-by-step solution
Virus means venom or poisonous fluid. Dmitri Ivanowsky (1892) recognised certain microbes as causal organism of the mosaic disease of tobacco. These were found to be smaller than bacteria because they passed through bacteria-proof filters. M.W. Beijerinek(1898) demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and named the new pathogen “virus” and called the fluid as Contagium vivum fluidum (infectious living fluid). W.M. Stanley (1935) showed that viruses coul