Oswald Avery and Colleagues Strengthened Scientific Support That DNA Was

Multiple Choice

Oswald Avery and colleagues strengthened scientific support that DNA was the transforming factor by replicating the Griffith experiment with some important differences in experimental design.The key difference was:

A) purifying S strain DNA and RNA from other biomolecules.
B) systematically eliminating the impact of classes of S strain biomolecules using enzymatic digestion before mixing with R strain live cells.
C) injecting S strain DNA directly into R strain cells and observing the change in phenotype.
D) Avery used Escherichia coli rather than Streptococcus as it is easier to transform.
E) All of the answer options are correct.