Considering the Avery et al experiments, which of the following would have been the appropriate control experiment(s) to support their conclusions?
A: Addition of plain growth medium without heat-killed S cells to the R cells.
B: Addition of heat-killed S cell filtrate that had not been treated with any enzymes
C: Addition of DNAse-treated heat-killed R-cells to S cells.
D: A and B
E: All of the above.
Answer: D: A and B
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A. true B. false
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