7. Match each conclusion about the role of DNA as the molecule of inheritance to the correct experiment. Experiment Griffith's experiments with mice and S-and R-type bacteria Avery, MacLeod, and McCarty's extraction experiment Hershey and Chase's radioactively tagged bacteriophages Main Conclusion The genetic material injected by viruses is DNA. DNA is the transforming principle. A "transforming principle determines traits.

This question is about the historical experiments that helped to establish DNA as the molecule of inheritance. Each experiment provided evidence for a different aspect of DNA's role in heredity.<br /><br />1. Griffith's experiments with mice and S- and R-type bacteria: Griffith's experiments demonstrated that a "transforming principle" could transfer genetic information from one strain of bacteria to another, causing a change in the recipient strain's characteristics. This experiment was crucial in identifying DNA as the "transforming principle."<br /><br />2. Avery, MacLeod, and McCarty's extraction experiment: This experiment involved extracting DNA from heat-killed virulent bacteria and showing that this DNA could transform living, benign bacteria into virulent forms. This provided strong evidence that DNA is the "transforming principle."<br /><br />3. Hershey and Chase's radioactively tagged bacteriophages: This experiment used radioactive isotopes to label DNA and protein components of bacteriophages. After allowing the phages to infect bacteria, they found that only the radioactive DNA entered the bacterial cells, indicating that DNA, not protein, was the genetic material.<br /><br />Based on these experiments, the conclusions can be matched as follows:<br />- Griffith's experiments with mice and S- and R-type bacteria: DNA is the transforming principle.<br />- Avery, MacLeod, and McCarty's extraction experiment: DNA is the transforming principle.<br />- Hershey and Chase's radioactively tagged bacteriophages: The genetic material injected by viruses is DNA.