Experiments that led to the discovery of DNA. Spark notes Edition. Griffith. Experiment : S strain bacteria injected into mouse -> mouse died R strain bacteria injected into mouse -> mouse lived Heated S strain injected into mouse -> mouse lived
Spark notes Edition
Outcome: Cells contain a substance called transforming factor that can change the genome of a host.
Outcome: When the S strain was heated and killed its DNA was incorporated into the R strains DNA and changed the R strain into S strain.
*Still unknown whether DNA or protein was the “transforming factor”
Outcome: DNA NOT proteins were the source of genetic material. DNA is the “transforming factor”