T.O. Diener discovered a:
Correct answer: D. Free infectious RNA
- A. Free infectious DNA
- B. Infectious protein
- C. Bacteriophage
- D. Free infectious RNA
Explanation
1. Free infectious DNA-Avery, MacLeod, and McCarty (1944) indeed demonstrated that DNA is the "transforming principle," proving it carries genetic information. This was a landmark in molecular genetics. 2. Infectious protein (prion)-Stanley Prusiner (1982, Nobel Prize in 1997) introduced the term "prion" and demonstrated that certain diseases are caused by protein-only infectious agents. 3. Bacteriophage - Frederick Twort (1915) first observed a "filterable agent" that killed bacteria, and Félix d'Hérelle (1917) independently discovered and named bacteriophage. 4. Free infectious RNA-This concept is best represented by viroids (discovered by Theodor Diener in 1971), which are small circular RNAs that infect plants. Some RNA viruses also highlight RNA as infectious material, but unlike DNA, there wasn't a single definitive early experiment attributed to just RNA.
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Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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