Select the wrong statement
Correct answer: C. The viroids were discovered by D.J. Ivanovsky.
- A. The term 'contagium vivum fluidum' was coined by M. W. Beijerinck.
- B. Mosaic disease in tobacco and AIDS in human beings are caused by viruses.
- C. The viroids were discovered by D.J. Ivanovsky.
- D. W. M. Stanley showed that viruses could be crystallized.
Explanation
1. "The term 'contagium vivum fluidum' was coined by M. W. Beijerinck." - Correct. Beijerinck coined this term for infectious agents smaller than bacteria, now known as viruses.2. "Mosaic disease in tobacco and AIDS in human beings are caused by viruses." - Correct. Mosaic disease is caused by a virus, and AIDS results from HIV, a specific virus.3. "The viroids were discovered by D.J. Ivanowsky." - Incorrect. Viroids were discovered by Theodor O. Diener, not Ivanovsky.4. "W.M. Stanley showed that viruses could be crystallized." - Correct. Stanley crystallized the tobacco mosaic virus in 1935, showing viruses could be purified and studied.
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About Acellular Life
Viruses are acellular infectious particles whose capsid, nucleic acid and host-dependent replication distinguish them from living cells. HIV infection covers transmission, replication, effects on helper T cells, progression to AIDS, symptoms, prevention and treatment, while AIDS is the disease state caused by advanced immune-system damage rather than a separate virus.
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