A reasonable conclusion to draw from the results of the experiment is that

In the 1940's, Avery, MacCleod, and McCarty transformed nonencapsulated bacteria into encapsulated forms by growing the nonencapsulated cells in a culture containing an extract made from dead encapsulated cells. The transformed cells produced colonies of encapsulated bacteria. Three different procedures and their results are outlined below.
Procedure I
Exact made from dead encapsulated cells added to culture medium.
Nonencapsulated bacteria added to culture medium.
Results Both nonencapsulated and encapsulated bacteria grow.
Procedure II
Extract made from dead encapsulated cells treated with protein-degrading enzymes
before adding exact to culture medium.
Nonencapsulated bacteria added to culture medium.
Results Both nonencapsulated and encapsulated bacteria grow.
Procedure III
Extract made from dead encapsulated cells treated with DNAse (an enzyme that
selectively destroys DNA) before adding extract to culture medium.
Nonencapsulated bacteria added to culture medium.
Results Only nonencapsulated bacteria grow.