When avery and his colleagues had obtained the transforming factor from the iiis virulent cells, they treated the fraction with proteases, ribonuclease, and deoxyribonuclease, followed by the assay for retention or loss of transforming ability. part awhat was the purpose of these experiments? a. to determine the exact molecular species of the "transforming principle"b. to prove that transforming ability does not depend on presence of any enzymesc. to determine the enzyme that can suppress virulenced. to prove the stability of the "transforming priniciple" in a typical cell medium

Option (A).

Explanation:

Transforming principle was the term used during the Griffith experiment. There was molecule that converts the non-virulent bacteria into a virulent bacteria and explains the transforming principle.

Avery and colleagues repeated the experiment and treat the virulent cells with protease ( enzyme that can cleave protein), ribonuclease (RNA digesting enzyme ) and deoxyribonuclease (DNA digesting enzyme). This experiment was done to find the molecular species that acts as the transforming principle. The transforming principle was found to be DNA by this experiment.

Thus, the correct answer is option (A).

substitution is the answer in this case