Practice!

Sample Problem

Which part of Griffith’s experiment helped him discover bacterial transformation?

Solution

(D) is the correct answer. Griffith discovered bacterial transformation in his last experiment because when he took blood samples from the dead mice, he discovered that the mice had live pathogenic cells in their blood. This showed that the pathogenic material from the dead cells had somehow been integrated into the live nonpathogenic bacteria. The other experiments acted more as controls to set up for the final experiment.