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The unequivocal proof of DNA as the genetic material came from the studies on a

1. bacterium
2. fungus
3. viroid
4. bacterial virus

Correct answer: bacterial virus

Solution

The decisive evidence came from bacteriophages, which infect bacteria and allowed researchers to separate viral DNA from protein. Experiments showed that the DNA entered the host and directed production of new viruses, proving DNA was the genetic material.

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