Which enzymes were used by Avery,MacLeod,and McCarty in their experiment to determine the transforming principle?

Following representations $P$,$Q$ and $R$ denote few steps of the Griffith Experiment. Identify the correct one$(s)$:
$P. R$ strain $\rightarrow$ Inject into mice $\rightarrow$ Mice die
$Q. S$ strain (Heat killed) $\rightarrow$ Inject into mice $\rightarrow$ Mice die
$R. R$ strain $\rightarrow$ Inject into mice $\rightarrow$ Mice live

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

What is the correct sequence of steps performed in the Hershey and Chase experiment?

In chromosomes,the material controlling heredity is

The scientist who isolated protein and nucleic acid from nuclein is: