The unequivocal proof of $DNA$ as the genetic material came from the studies on a

Which of the following is false for $RNA$?

$(i)$ $RNA$ can directly code for the synthesis of proteins

$(ii)$ It is very common process to synthesis $DNA$ from $RNA$

$(iii)$ $RNA$ is used as genetic material only in human

$(iv)$ One polynucleotide chain is present in $RNA$

Chemically $DNA$ differs from $RNA$ in having

In chromosomes, the material controlling heredity is

Who proved first time that $DNA$ is a genetic material