The unequivocal proof of DNA as the genetic material came from the studies on a
bacterium
fungus
viroid
bacterial virus
As learnt in
In Genertic Material in DNA -
The unequivocal proof that DNA is the genetic material came from experiments of Alfred Hershey and Martha Chase (1952).
- wherein
They worked with virus that infect bacteria called "bacteriophages"
Bacteriophages are bacterial virus.
Option 1)
bacterium
This option is incorrect
Option 2)
fungus
This option is incorrect
Option 3)
viroid
This option is incorrect
Option 4)
bacterial virus
This option is correct