1.      DNA is a stable molecule

2. The amount of DNA in a given species is constant for all cells.
3. Mutation or changes in the composition of DNA alter the organisms’ characteristics.
4. Purified DNA rather than proteins from dead virulent bacterium Pneumococcus strain which causes pneumonia was shown to transform the non-virulent form into a virulent form. The ability of DNA to transform nonvirulent form was stopped by addition of an enzyme that breaks DNA in the dead virulent form before DNA was purified.
5. DNA rather than proteins of bacteriophage (T₂ phage) that infect E. coli was shown to be the hereditary material because it enabled the E. coli to synthesize the new T₂ phages viruses.

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Dr. Bbosa Science