Hershey and Chase grew some viruses on a medium that contained radioactive $.........$ and some others on medium that contained radioactive $.........$

Analyze the following experimental steps performed by Frederick Griffith:
$I - R$ strain $\rightarrow$ injected into mice
$II - S$ strain $\rightarrow$ injected into mice
$III - S$ strain (heat-killed) $\rightarrow$ injected into mice
$IV - S$ strain (heat-killed) $+ R$ strain (live) $\rightarrow$ injected into mice
In which of the above stages will the mice remain alive?

$A$ series of experiments were conducted by Frederick Griffith in $1928$,on the transforming principle with:

In which medium were the viruses grown so that the infected bacteria became radioactive?

State the criteria that a molecule must fulfill to act as a genetic material.

Describe the experiment of Hershey and Chase that proved $DNA$ is the genetic material.