What happens if heat-killed $R$-strain and live $S$-strain bacteria are injected into a mouse?

In which of the following is $DNA$ the genetic material?

If the transforming principle is transferred to the $R$-strain,what characteristics will the $R$-strain acquire?
$(i)$ Formation of a smooth polysaccharide coat
$(ii)$ Becomes non-virulent
$(iii)$ Becomes virulent
$(iv)$ Does not form a smooth polysaccharide coat

Which enzyme inhibits the process of transformation?

Give an account of the Hershey and Chase experiment. What did it conclusively prove? If both $DNA$ and proteins contained phosphorus and sulphur,do you think the result would have been the same?

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