Answer:
Only the extracts from heat-killed cells treated with RNase are unable to transform nonvirulent bacteria into virulent bacteria.
Explanation:
The experiment by Avery, McCarty and MacLeod aimed to identify Griffith's "transforming principle," which is a principle that explains how transformation is a way of recombining, exchanging, or transferring genetic information between organisms or from one organism to another. For this, they used cell that were heat inactivated and purified the transforming principle of these cells.
The purified cells did not give positive results in the tests done by the scientists, but they presented transformants very similar to the DNA. However, Avery suspected that the result should be reinterpreted and that the molecule was not a DNA. This is because RNA degrading enzymes had no effect on the transforming principle and only RNase-treated heat-killed cell extracts are unable to transform non-virulent bacteria into virulent bacteria.
Answer: This view fits best with "THE PRAGMATIC THEORY OF TRUTH".
Explanation: The pragmatic theory of truth states that something or a statement can be true, if only it have been tested and practice to be true. It means that truth can only be verified by experimenting ones belief or concept.
For science to use electron which is believed doesn't physically exist to explain concept that physically exist, that means the truth of the existence of an electron has has been tested and has gone through practicals, which shows that electron exist. The pragmatic theory of truth proves the existence of an electron to be true because it has been proven and tested to be true, using some physical principle, even though it has not been physically seen. Many scientific theories uses pragmatic theory of truth, to stand it's statement to be truth.
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